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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

Welcome to the wondrous world of pregnancy! Here’s what could be going on with you and your baby as you start your nine-month journey.

First trimester of pregnancy week by week

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  • Weeks 1-4
  • Weeks 5-8
  • Weeks 9-12

1 Week Pregnant: Week-by-Week Guide

This week you're actually on your period. Your uterine lining is shedding,...
2 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

3 Weeks Pregnant: Week-by-Week Guide

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

Pregnancy month by month in the first trimester

Second trimester

Explore some of the exciting new changes that could happen to you and your baby during your pregnancy’s midpoint.

Second trimester of pregnancy week by week

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  • Weeks 13-16
  • Weeks 17-20
  • Weeks 21-24

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

Pregnancy month by month in the second trimester

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Third trimester

You’re in the home stretch! Let’s take a look at what you and your baby could be experiencing as you get ready to meet your little one.

Third trimester of pregnancy week by week

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  • Weeks 25-28
  • Weeks 29-32
  • Weeks 33-36

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

Pregnancy month by month in the third trimester

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.