Prenatal Development

What you might expect at each stage of your pregnancy: week by week, by month, and by trimester.

Jump to your pregnancy trimester

First trimester Second trimester Third trimester

First trimester of pregnancy week by week

1 Week Pregnant: Week-by-Week Guide

This week you're actually on your period. Your uterine lining is shedding,...

2 min read

3 Weeks Pregnant: Week-by-Week Guide

If you haven't already done so, buy your folic acid supplements, as they...

5 min read

2 Weeks Pregnant: Week-by-Week Guide

This week your egg is released in hopes of being fertilized. It's likely...

5 min read

4 Weeks Pregnant: Week-by-Week Guide

Your baby is now an embryo made up of two layers of cells, which will...

4 min read

By clicking “Join now” I agree to participate in the sweepstakes. I agree to join Enfamil Family Beginnings and receive free samples, offers and other communications from Enfamil, and may receive communication about Enfamil’s affiliated Reckitt brands. I understand and agree to the Terms of Use, Privacy Policy and Sweepstakes Official Rules.

Second trimester of pregnancy week by week

13 Weeks Pregnant: Week-by-Week Guide

Welcome to the second trimester! The inner ear - which regulates balance -...

4 min read

14 Weeks Pregnant: Week-by-Week Guide

Your little one is getting ready for a growth spurt. Hair follicles start...

4 min read

15 Weeks Pregnant: Week-by-Week Guide

Your baby may start to get active at this point, moving around their arms,...

4 min read

16 Weeks Pregnant: Week-by-Week Guide

Your baby can now hold their head upright and the development of their...

5 min read

Have questions about your pregnancy? Ask a nurse anything 24/7.*

Available for Enfamil Family Beginnings members.

Learn More

*Ask a Nurse is currently not yet available in the following states: AK, HI, MN, NV, OR.

Third trimester of pregnancy week by week

25 Weeks Pregnant: Week-by-Week Guide

Your baby's memory is beginning to develop, as well as his or her hearing,...

5 min read

26 Weeks Pregnant: Week-by-Week Guide

Your baby's neural and brain tissue is developing at a rapid rate and their...

5 min read

27 Weeks Pregnant: Week-by-Week Guide

As their hearing continues to develop, your baby may begin to recognize...

5 min read

28 Weeks Pregnant: Week-by-Week Guide

Over the next few weeks, more than 50% of the energy your baby uses goes to...

5 min read

Explore other pregnancy topics

Nutrition

Here's what you need to know about pregnancy nutrition and nourishing your baby's healthy growth and development.

Planning

We've got everything you need for planning for your baby and giving birth.

Recipes

These recipes are packed with important nutrients you and your baby need during pregnancy.

Workouts

In addition to managing a healthy weight and reducing stress, exercising during pregnancy can help reduce the time of recovery after delivery. Find expert workout videos to help get you going.

Labor and Delivery

Learn about labor and delivery with Enfamil. Explore articles on what to expect during labor and delivery and start preparing for the arrival of your little one today.