September 30, 2023

Being pregnant may be some of the thrilling instances in a mother or father’s life. Sadly, for a lot of, it may possibly additionally deliver numerous challenges and anxieties. For me, I at all times struggled with being pregnant. From feeling self-conscious to all these aches and pains, I had a particularly laborious time feeling constructive about being pregnant. That is why it was so important for me to search out issues that helped me really feel extra constructive and to look ahead to the little child on the finish of the lengthy highway.

One of many issues that helped me essentially the most was maintaining monitor of my child’s improvement every month! Not solely did it assist me really feel like issues had been progressing regardless of the sensation that being pregnant simply dragged on, but it surely additionally helped me hook up with that little child I could not but see.

So whether or not you simply wish to begin constructing that bond along with your child even earlier than beginning or you’re simply interested in what on the earth is going on in there, here is your information to your baby’s improvement throughout being pregnant!

Being pregnant Timeline Defined

Beginning out, it is essential to grasp simply how the timeline for being pregnant performs out. When going to your first prenatal appointment, it’s possible you’ll discover that your healthcare supplier will ask you while you final had your interval. It is because your official being pregnant “begin date” comes earlier than your child is even conceived. In truth, the primary day of your final interval is when your being pregnant formally begins. For the sake of this text, after I consult with a developmental stage in “weeks”, I am going off of this official begin date (regardless that your child was technically conceived about 2 weeks later).

The rationale why suppliers go off of this date is as a result of it has been proven to present essentially the most correct indicator of when you’ll ship, as figuring out when a lady ovulated or the precise second they conceived is fairly troublesome to calculate. Nonetheless, since each lady’s menstrual cycle is totally different, it is essential to keep in mind that it is not a precise science. That is why only a few girls ship on their precise due date (less than 5%!) So attempt to keep in mind this all through your being pregnant and do not rely an excessive amount of on the particular date.

Basically, although, girls are pregnant for 40 weeks or 280 days. This equates to about 9 months. When pregnant with my first, this confused me a bit. If most months have about 4 weeks in them, that may make being pregnant 10 months lengthy. And a few on-line guides will outline every “month” as 4 weeks, supplying you with a ten month being pregnant timeline.

We all know this is not solely correct although, as a result of every month of the 12 months varies–some have 4 weeks, whereas most months are a bit longer than 4 weeks. With a purpose to simplify issues, I’ll hold issues a bit extra common and focus on the fundamentals of what is taking place every month (particularly as a result of infants will develop at barely totally different charges.) A few of my “months” will technically have 5 weeks in them. This enables me to divide the months in a approach that makes essentially the most sense developmentally. 

One other word about being pregnant timelines to remember: there will likely be some slight variations in what’s thought-about a trimester amongst specialists. Some consult with the primary trimester as the primary 12 weeks, whereas some say it lasts till the beginning of week 14. On this article, I will likely be going by the broadly accepted rule of 0 by way of the tip of week 13 for the primary trimester, 14 by way of the tip of 27 weeks for the second, and 28 to 40 weeks for the third. 

So with all that in thoughts, here is your month-by-month information to your child’s improvement throughout being pregnant!

Pregnant Mom

First Trimester

Month 1 (Weeks 1 by way of about 5)

As I stated earlier than, being pregnant technically begins earlier than conception! So the primary week of being pregnant, you’ll really be on the final interval you will have for some time. Someday in the course of the second week, you’ll ovulate. It’s right now that you must have intercourse in the event you’re actively attempting to conceive. Having intercourse earlier than you suppose ovulation will happen gives you the very best likelihood to conceive, as sperm can survive as much as 5 (typically extra) days contained in the physique, however as soon as the egg is launched, it is just viable for about 24 hours. If the sperm finds the egg, fertilization has formally occurred, and what’s referred to as a “zygote” will type!

Subsequent (throughout week 3), the fertilized egg will journey to its final destination-the uterus- the place it’s going to then implant into the wall of the uterus. Because it makes its journey, the cells are consistently dividing, and the “blastocyst” kinds. Because the blastocyst begins implanting within the uterus, it divides into 2 parts-half of which turns into the embryo, and the opposite half will type the placenta. The amniotic sac will even type round your child, which is able to assist shield your baby in the course of the subsequent 9 months!

The embryo will then divide into 3 layers: the ectoderm, which is able to type the pores and skin, nervous system, eyes, and ears; the mesoderm, which is able to turn into the center in addition to the skeletal system, kidneys, and reproductive system; and the endoderm, which turns into the intestines and lungs. One of many first issues that may develop from this division is the neural tube, which is able to finally turn into the mind and spinal wire.

Close to the tip of the primary month, implantation turns into full, and also you now have an embryo! You will have in all probability missed your interval by this level as nicely, as implantation indicators to your physique that you just’re pregnant. This results in a cascade in modifications in your hormones, and it’s possible you’ll begin experiencing a few of your first being pregnant signs.

Though it could seem to be not lots is going on on this first month since about half of it’s simply constructing as much as conception, many important issues are taking place! As quickly because the embryo kinds, numerous important components start to develop! That is why it’s so essential that you just put together for a wholesome being pregnant even earlier than you get pregnant by studying all which you could.

Top-of-the-line issues you are able to do for each you AND your future child is to start out taking a top quality prenatal vitamin a minimum of a month earlier than attempting to conceive. This may hold you sturdy whereas additionally serving to your child to develop correctly as nicely.

Month 1 Overview:

  • Conception happens & a zygote kinds
  • Cells begin to divide, blastocyst kinds
  • Blastocyst implants within the uterus
  • Division into placenta and embryo happen
  • Hormonal modifications happen, resulting in missed interval
  • Embryo divides into 3 layers: the ectoderm, mesoderm, and endoderm
  • Neural tube kinds

Child’s dimension on the finish of 5 weeks: Sesame seed

Baby at 5 weeks

Photograph Supply: Baby Center

Month 2 (Weeks 6 by way of 9)

As soon as the embryo develops in month 1, huge issues proceed to occur! It is right now that the neural tube closes, giving rise to mind and backbone improvement! On the similar time, different main organs, such because the cardiovascular, respiratory, and digestive organs, begin to develop. As the center begins to develop, it’s going to begin to make pumping motions, which may typically be seen on ultrasound!

Additionally it is in month 2 that your child begins to look rather more like a child! The embryo begins to tackle a C-shape and little tiny bumps type that may quickly turn into legs and arms. In weeks 7 by way of 9, particularly, the top, facial options, and limbs will turn into extra outstanding. By the tip of month 2, these little frog-like fingers and toes now have apparent fingers and toes, and the ears, eyes, nostril, and tiny lips have begun to type. 

With all of the speedy organ improvement, that is once more why taking a prenatal earlier than getting pregnant is so essential!

Month 2 Overview:

  • Neural tube closes off and can turn into the mind and backbone
  • Coronary heart and different main organs proceed to develop
  • Embryo takes on C-shape, however begins to straighten out by finish of week 9
  • Legs and arms type, fingers and toes develop
  • Facial options turn into extra obvious-ears, eyes, nostril, and lips type
  • “Tail” begins to vanish
  • Umbilical wire is totally fashioned and begins offering child with all it wants

Child’s dimension on the finish of 9 weeks: Concerning the diameter of a penny in size, a bit of macaroni, or the scale of grape

Baby at 9 weeks pregnant

Photograph Supply: Household Schooling

Month 3 (Weeks 10-13)

Up till this level, your child’s head has been the largest a part of their little physique. In month 3, nevertheless, their physique will develop, and their head will begin to turn into a bit of extra spherical. The fingers and toes lose their webbing, and your child’s elbows start to operate, permitting for bending of the arms. By the tip of month 3, the finger and toenails will even begin to develop.

Their facial options additionally turn into much more outstanding than they had been final month, as their ears proceed to take form on the edges of their head. Your child will even begin to open and shut his or her mouth (the place little tooth are forming underneath the gums!)

Relating to organ improvement, bile is starting to be synthesized within the liver. Blood cells are fashioned, and start to flow into, and urine is starting to be produced as nicely by the kidneys. The muscular and skeletal methods proceed to develop as bones type from cartilage, and the intestines have fashioned inside the stomach, the place in just some months they are going to be used to course of their breastmilk or components.

One other notable improvement that happens in month 3 is the exterior genitalia begin to type! Nonetheless, it’s typically too quickly to find out the intercourse of the infant on an ultrasound. It is because, at this time limit, the creating genitals of each feminine and males are nonetheless very tiny, and the clitoris and penis development appears pretty related. So it is best to attend till the 20 week anatomy scan for a extra definitive reply (until you do a blood check that reveals the gender for you!)

It is also in month 3 when your little embryo turns into a fetus, and your threat of miscarriage drops drastically!

Month 3 Overview:

  • Your baby is now a fetus
  • Child’s physique dimension is rising, so head and physique are a bit extra proportional
  • Fingers and toes lose webbing, and fingernails begin to type
  • Facial options turn into extra outstanding, ears are actually on the aspect of the top
  • Blood cells are synthesized and start to flow into
  • Bile is being synthesized by the liver
  • Urine is fashioned
  • Intestines are within the stomach now
  • Bones begin to harden
  • Tooth are starting to type
  • Exterior genitalia kinds

Child’s dimension on the finish of 13 weeks: Small lemon or massive plum

Fetus 13 Weeks

Photograph Supply: What to Count on

Second Trimester

Month 4 (Weeks 14-17)

Across the begin of your 4th month of being pregnant, you formally enter the second trimester! Up till this level, your little child has been fairly clear. Throughout month 4, the pores and skin begins to get thicker, and hair begins to develop on their physique. This consists of little eyelashes and eyebrows. The facial options additionally proceed to maneuver in order that once they’re born they are going to be within the correct place on their little head.

Actions turn into extra apparent, and when you’ve got a posterior placenta, you’ll probably start to really feel little moments (referred to as quickening) as your child stretches, brings their fingers to their mouth, and turns their head. Nonetheless, if that is your first child or when you’ve got an anterior placenta, then it may be a bit longer earlier than you’re feeling something.

Month 4 can be an thrilling time as a result of your child begins doing issues that she or he will do after beginning, equivalent to sucking his or her thumb, swallowing, and even smiling. Ears and eyes are extra developed now as nicely, so your child will begin to turn into extra delicate to lights and sounds. So be happy to sing and discuss to your child at any level now!

Month 4 Overview

  • Prints on fingers and toes type
  • Vocal cords have fashioned
  • Facial options proceed to maneuver to the suitable place on the face
  • Hair begins to develop
  • Pores and skin begins to thicken
  • Motion will increase as limbs and joints proceed to develop
  • Sucking and swallowing begin
  • Coronary heart is now pumping plenty of blood by way of the physique every day
  • Child begins to react to lights and sounds

Child’s dimension on the finish of 17 weeks: Onion or turnip

Baby 17 weeks

Photograph Supply: Occasions of India

Month 5 (Weeks 18-22)

Though some soon-to-be mommas will begin to really feel motion in month 4, month 5 is when it occurs for many! If so for you, it’s possible you’ll begin to choose up on when your child is awake and when they’re sleeping, as sleep cycles start to type! 

Different motion it’s possible you’ll begin to discover right now is hiccupping. As their lungs proceed to develop, their diaphragm might spasm, inflicting hiccups. The bronchioles inside the lungs turn into rather more developed throughout month 5, which is able to assist your child to breathe (and cry) after beginning.

Many of the organs have developed to some extent the place they’re functioning nicely. The center is pumping cells which might be fashioned by the bone marrow, liver and spleen, and the lobes of the mind are persevering with to develop.

In month 5, child will even begin to placed on weight and fats. Vernix caseosa and lanugo will even start to cowl your child’s physique. These will proceed to type within the coming weeks and as your child enters the third trimester.

Month 5 Overview:

  • Sleep and wake cycles begin to type
  • Hiccupping begins as lungs proceed to mature and develop
  • Fats is forming
  • Exterior genitalia have fashioned and may now be detected extra precisely on an ultrasound
  • Mind lobes are creating 
  • Vernix Caseosa and lanugo are actually beginning to cowl child
  • Child might begin consuming amniotic fluid to follow swallowing

Child’s dimension on the finish of twenty-two weeks: Papaya

baby 22 weeks

Photograph Supply: What to Count on

Month 6 (Weeks 23-27)

Throughout the previous couple of weeks of your second trimester, your child will placed on rising weight. By the tip of this trimester, the chances of your child having the ability to survive in the event you went into labor early are fairly good with high quality neonatal care. The lungs have developed, which, together with the mind, are one of many final issues to mature. Nonetheless, there may be nonetheless rather more development that should occur within the coming months.

In month 6, these little eyelids will lastly begin to open, and your child might begin to blink. Melanin begins to be produced, which is able to finally give rise to your child’s distinctive eye and pores and skin tone. The ears will even start to listen to higher, which can even lead to your child turning into startled when loud sounds happen.

That lanugo and vernix caseosa that started to type in month 5 will proceed to type, and your child might proceed or begin to develop hair on their scalp in the event that they have not already.

Month 6 Overview:

  • Lanugo and vernix caseosa proceed to type
  • Melanin is produced
  • Eyelids might open for the primary time
  • Hair begins to develop on child’s head
  • Child continues to achieve fats
  • Ears develop extra totally and may hear sounds even higher

Child’s dimension on the finish of week 27: Cauliflower or cabbage


Photograph Supply: Twin Stuff

Third Trimester

Month 7 (Weeks 28-31)

You will have lastly reached your third trimester! For lots of mothers, that is the purpose the place nesting begins, you turn into more and more uncomfortable, and also you simply wish to meet your child already! Fortunately, there’s just some months left and you will be there! In month 7, your child begins prepping for beginning simply as you’re doing! They’re physique might begin to flip with their head down. 

One of many largest issues that occurs this month is the good strides in your child’s mind improvement! The bumps of the mind type, which permits for better floor space. This implies extra mind cells! Because of this speedy mind improvement, your child will begin to have the ability to regulate his or her personal physique temperature, one thing they may want to have the ability to do as soon as they’re now not inside you! This mind improvement additionally aids your child of their potential to reply even higher to stimuli like mild and sound.

Month 7 Overview:

  • Child begins to show with head dealing with down
  • Child blinks extra
  • REM sleep cycles start
  • Mind develops, bumps in mind type, child can interpret and reply to stimuli
  • Child continues to swallow amniotic fluid

Child’s dimension on the finish of 31 weeks: Coconut

baby 31 weeks

Photograph Supply: BabyCenter

Month 8 (Weeks 32-35)

Issues begin to wind down in month 8 of being pregnant. And though it is thrilling, it is essential to keep in mind that each day your child is inside you’ll give your child further time to develop and develop!

As talked about beforehand, a few of the final issues to mature are the mind and lungs. In month 8, the mind continues to get bigger together with the remainder of their physique. As your child places on weight and energy and because the bones harden, it’s possible you’ll get more and more uncomfortable as they kick and punch your different belly organs. Nonetheless, the bones within the cranium will keep mushy and moveable. This may permit simpler passage throughout supply.

Your child has additionally placed on numerous fats, and the pores and skin has thickened to the purpose which you could now not see by way of child’s pores and skin! Your child can be consuming LOTS of amniotic fluid every day. This may assist your child’s GI system be prepared for milk.

Month 8 Overview:

  • Mind and lungs continues to develop and develop
  • Skeletal bones proceed to harden
  • Bones in cranium keep mushy to help in supply
  • Child is consuming round a pint of amniotic fluid per day
  • Child is now not clear
  • Plenty of fats continues to construct up
  • All organs (besides lungs) are totally developed

Child’s dimension on the finish of week 35: Swiss chard or honeydew melon

baby 35 weeks

Photograph Credit score: SMA Child

Month 9 (Weeks 36-40)

You are virtually there! Month 9 can really feel prefer it by no means ends. However simply keep in mind that your child will come once they’re prepared. Belief your physique and know that it is aware of when it is time.

Within the closing weeks of being pregnant, your child will begin to shed the lanugo, or physique hair, that helped shield it within the womb. Though most will likely be passed by beginning, it’s possible you’ll discover some little tufts of hair (particularly behind the ears and on the arms) at beginning. 

Your child’s lungs additionally lastly attain the purpose the place they will operate independently and are able to breathe air! And naturally, that fats and weight continues to be piled on at a speedy tempo. The mind can be rising in dimension (though it’s technically totally developed).

Your child will even drop down into your pelvis to prepare for supply. It’s possible you’ll really feel numerous stress in your cervix. Simply know that it means you’ll meet your candy child quickly!

Month 9 Overview:

  • Weight is gained as child grows
  • Lungs are totally developed and able to breathe air
  • Lanugo is shed
  • Mind continues to develop in dimension
  • Child drops into pelvis to organize for supply

Child’s dimension at 40 weeks: Small pumpkin

Newborn Baby

For more information in your being pregnant, try of submit Your Information to a Wholesome Being pregnant from Conception to Delivery, and go to our weblog at!


Mayo Clinic
Cleveland Clinic
What to Expect
American Pregnancy Association
UI Health

Word: Though this data was checked on a number of sources to test for accuracy, keep in mind, that each child is totally different and can develop at barely totally different charges. And resulting from variations on findings in being pregnant research which have been carried out, there will likely be some slight discrepancies as to precisely when sure issues develop in a fetus.


Lindsey Swenson