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...

Q&A: What are 3D and 4D ultrasounds?

I've heard about 3D and 4D ultrasounds. What are these? Are they safe? Why would I have one?

Re: I've heard about 3D and 4D ultrasounds. What are these? Are they safe? Why would I have one?

The Bump Expert

Traditionally, 2D ultrasound allows you to see the fetus in cross-section only. For example, when looking at the fetus's face, 2D ultrasound will allow you to see the profile, but not the entire face in one picture. 3D ultrasound, on the other hand, allows you to see the surface of the whole face in one picture -- much like taking a photograph. 4D ultrasound adds the dimension of time, so instead of seeing a 3D snapshot of the face, you get the face moving in real-time (grimacing, opening and closing its eyes, sticking out its tongue), just as in a videotape.

The medical reasons for using 3D and 4D ultrasounds are limited. Currently, we use them when a fetal abnormality is seen or suspected. 3D and 4D ultrasounds can help doctors determine the extent of the abnormality, and parents better understand it.

When used for medical purposes such as screening for abnormalities or tracking a known fetal abnormality, 3D and 4D ultrasounds appear to be safe. Although several studies of ultrasound in animals have shown effects on brain cells, hundreds of others have concluded ultrasound in pregnancy to be safe. To minimize risk, always have your ultrasound in a center with experienced technicians or physicians.

Recently, shopping malls and other freestanding commercial sites have started offering pictures or entertainment videos of fetuses. Remember -- ultrasound is intended for medical diagnosis, and "entertainment" ultrasound is considered an unapproved use of a medical device by the FDA. These sites might not be equipped to answer questions that arise during your visit ("Does everything look normal?"), abnormalities could be missed, and you may gain false reassurance. The American College of Obstetricians and Gynecologists and the American Institute of Ultrasound in Medicine, the main overseeing bodies for ultrasound in obstetrics, discourage the use of ultrasound for non-medical purposes.

Dr. Ashley Roman

tools

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