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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13 Weeks Pregnant

Yay! It’s the last week of the first trimester and you did it. We’re not just talking about getting through those work meetings without falling asleep (or puking!), we’re talking about how you’ve completed one whole third of your pregnancy -- and the reputed toughest one at that. You’ve grown a fetus that has vocal cords, teeth and even fingerprints (wow!) and you probably kept this incredible news (mostly) secret while you constantly wished you could shout it from the rooftops -- or, at the very least, use it as an excuse for getting to work late. It’s about this time that many parents-to-be start spreading the word (to more people than just close family and friends) that there’s a baby on the way. But know that there are no hard and fast rules about when you should divulge your secret. It could be after your next prenatal doctor visit, once you start showing or at a big family event where everyone will be gathered. Or maybe everyone already knows! That’s totally your call.

your baby's the size of a peach!
She's about 2.9 inches long and weighs about .81 ounces, and -- proportion-wise -- her head's now about 1/3 the size of her body (remember? It used to be bigger!).

your baby at 13 weeks
  • Can you believe she's forming vocal cords and teeth?!
  • And even though she's still teeny, she already has fingerprints.
  • Her intestines are moving from the umbilical cord to their more permanent place, in her tummy.

pregnancy symptoms at 13 weeks

your must-do's

your nice-to-do's
  • Celebrate -- one trimester down, two to go!
  • Start planning maternity leave
  • Make sure you're exercising! You'll probably feel more energized during the second trimester, so take advantage.

watch: your bump, week 13

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