Pregnancy Week by Week

Get a window on what’s happening in your pregnancy, week by week. From week four to week 42, your baby is experiencing a miraculous transformation from a clump of cells to a fully formed (and totally cute) newborn. Just imagine, as early as five weeks, your baby is already starting to form major organs (heart, stomach, liver, and kidneys) and systems (digestive, circulatory, nervous). By eight weeks, your raspberry-sized womb-mate is moving her arms and legs. At the beginning of your second trimester (week 14), your wee one is sucking his thumb. By week 28, the first week of the third trimester, baby (now as big as an eggplant) is prepping for breathing, developing his eyesight and packing on pounds in anticipation of life outside the womb. Each week is a new miracle. Less miraculous is how a mom-to-be may feel. Pregnancy Week-by-Week charts your baby’s development but also lets mom know what she might be feeling during each week of her pregnancy. Pregnancy week by Week includes everything mom needs to know to feel a sense of control over her pregnancy. Each week offers a complete guide to what you might feel, your must-do’s, your nice-to do’s, and answers and advice on everything pregnancy-related. Plus each week’s guide offers tips on maintaining a healthy and comfortable pregnancy from strategies on coping with pregnancy symptoms (morning sickness anyone?) to ideas for healthy eating, and pointers on talking to your OB. Let us guide you along your pregnancy, week by week.

More about pregnancy week-by-week Less about pregnancy week-by-week

baby registry

need to buy a gift?

Find baby registries (at top retailers!) and websites with one easy search.

what's hot around the web

baby websites

you asked...

What is colostrum?

I keep hearing about colostrum. What the heck is it, anyhow?


I keep hearing about colostrum. What the heck is it, anyhow?

The Bump Expert

Colostrum is baby’s first food! It’s a thin, yellowish fluid that your breasts produce at birth. In fact, you may have noticed some of it leaking from your boobs toward the end of pregnancy.

Colostrum is full of proteins and antibodies to help baby build her immune system, and it’s all baby needs to eat in her first three to four days. After that (as long as you keep breastfeeding), your body will start to produce breast milk.

One of the coolest things about breast milk is that it continues to change over time. At first, it’s thin, watery and sweet -- mostly a thirst quencher (with sugar, proteins and minerals) -- and over time, it becomes thicker and creamier to satisfy your hungry baby.

Plus, more from The Bump:

Leaky breasts in third trimester?

Darkened Areolas During Pregnancy

Breastfeeding Basics

Source: Your Pregnancy and Childbirth: Month to Month by The American College of Obstetricians and Gynecologists

The Bump Editors


My Pregnancy Calendar
Count down to delivery with your pregnancy calendar.
baby names
Browse 1000s of baby names in our Baby Namer tool.
pregnancy tickers
Create your own pregnancy ticker.
how big is baby
From poppyseed to papaya, see how baby grows each week.

>> See all tools