First Trimester: Images of Your Developing Baby

We've partnered with the American Institute of Ultrasound Medicine (AIUM), Johns Hopkins, and the March of Dimes to create this unique peak into Baby's development inside the womb. These images reveal all the intricate details of your baby's growth -- from a collection of cells to a full-term newborn. While most women may only receive one or two ultrasounds during pregnancy, which is normal, this slideshow of the 1st trimester of pregnancy gives you a look at each week of development.

By Kristen J. Gough

iStock/Jupiter Images

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Weeks 1 and 2

There's no ultrasound image of your baby-to-be for weeks 1 and 2. While your health care provider counts these two weeks toward your due date, you aren't really pregnant. Confused? Your pregnancy due date is calculated using the first day of your last menstrual period (LMP). Obviously you weren't pregnant at that time, but it's the best reference your health care provider has for estimating baby's arrival day (until you get an ultrasound, which may provide a more accurate due date).

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Comments (33)

fancybrown2111 wrote:

I am 7 weeks long and i am pregnant with my third child, I am 27 years old and my second child is five years i am really hoping for a boy because i have two girls already I must say that this pregnancy is totally different because with my other two pregnancy i did not have the amount of sickness that i have now, i want to eat around the clock i sleep every day at least two times per day and i have a lot of back pain my stomach get upset very easy and the bad feelings is too much..

1/28/2012 11:36:20 AM Report Abuse

sputnick_775661 wrote:

I wish all of you the best of luck with your pregnancy's. I have had three miscarriages and the last one is the worst. I was 15 weeks along, we are hoping to find out wat is causing all of this. I would of had a baby boy. My boyfriend has 2 children already this would have been our first together. I know that feeling of morning sickness and definatly the one of the boobs being really sore, it dont get any nicer the further you get along.

12/14/2011 03:20:41 PM Report Abuse

christinedaughe wrote:

Im 5 weeks and 2 days and Im 23yrs old. My husband is 21. We are excited this is our first after we had a misscarrage last Dec. I dont have any strong symptoms yet. Just HUNGRY all the time. I eat all day. Ive gained weight in the last 3 weeks because I cant get my jeans to button up and my belly is starting to poke out. No morning sickness yet. knock on wood and my boobs are so sore and swollen.

12/13/2011 06:55:04 PM Report Abuse

heatherharris26 wrote:

I am 5 weeks with our 2nd child. I am 27 years old. I have to say this pregnancy is totally different then my first. When i was pregnant with our son i had no symptoms only a missed period but with this you can nausea a missed period and nausea is all i have i am happy that that is it but it is still early. I hope i am having a girl. We have a 2 year old son now we need a girl. I am due in April.

8/6/2011 07:42:22 PM Report Abuse

black.empress1 wrote:

i am 20 weeks along with my 3rd child and it feels so excited to do it all over again..though with this pregnancy i was diagnosed with high blood risk of down syndrome..1in 300 ..but my doctor recommends a high screen check up for birth defects...sort of worried about it..should i be?

4/20/2011 03:13:16 PM Report Abuse