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.

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21 Weeks Pregnant

Pressure’s on. Have you found the perfect baby name yet? It seems like parents-to-be either come up with baby’s name quickly and easily, or agonize over it all the way up until the birth. Either way, once you find one that seems perfect, you’ll probably think it’s even more perfect once you get to know (and fall in love with) the little bundle of joy who’ll go by it. At 21 weeks, not only are you likely to be looking anywhere and everywhere for baby name ideas, but you might be getting a sneak preview of some third trimester symptoms, such as leaky boobs, Braxton Hicks contractions and heartburn. While your body preps for baby’s arrival, you’re probably hard at work getting your home ready too. Of course, things like baby bouncers and changing table pads can be tough to choose from, but try not to stress. Baby won’t care if you pick out a playard that clashes with the area rug.

your baby's the size of a pomegranate!
At 10.5 inches and about 12.7 ounces, she's big enough now that you've probably been feeling her movements.

your baby at 21 weeks
  • As her digestive system preps for the outside world, she's manufacturing meconium -- the tarry black substance you'll find in her first dirty diaper (ew)!
  • If it's a girl, she's already got a lifetime's supply of eggs in her womb -- about six million of them!

pregnancy symptoms at 21 weeks
  • Some heartburn and/or indigestion. Avoid spicy and greasy foods and other triggers.
  • Braxton Hicks contractions. Your uterus might occasionally feel tight as it practices for labor.
  • Leaky boobs. Your milk ducts will be fully developed by the end of this trimester.
  • Dry, itchy skin, from all that stretching over your growing bump.
  • Stretch marks. You skin gets pulled thinner as baby grows. Don't worry, they should fade significantly after birth.

your must-do's
your nice-to-do's

watch: your bump, week 21

Reminder: Medical info on The Bump is FYI only and doesn't replace a visit to a medical professional.