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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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4 Weeks Pregnant

Congratulations! If you know you're four weeks pregnant, you found out the news earlier than most women probably do -- and you might be totally excited, or you might be still getting used to the idea. Either way, it’s likely you’re not feeling any different (for now, at least), since most early pregnancy symptoms have not have kicked in yet. Be sure to celebrate this amazing news with your partner but don't tell the world yet. Your first call is to your doctor to schedule your first prenatal visit when they can confirm your pregnancy. And even though your baby-to-be is still tiny, he’s already undergoing important development at week four of pregnancy, so start taking a prenatal vitamin. Look for one with at least 400 micrograms of folic acid and remember to take it daily. We know you’ve got a lot on your mind, but since folic acid is proven to help prevent birth defects, this is super important!

your baby's the size of a poppyseed!
At 4 weeks, your baby, now known as a blastocyst, is practically microscopic -- a teeny ball of cells. She's busy settling into her new home (your uterus), prepping for all the crucial development she'll be doing over the next six weeks.

your baby at 4 weeks
  • The ball of cells is splitting into the embryo (your future child) and placenta.
  • Baby's neural tube, the building block of his spine, brain and backbone, is already formed.
  • The amniotic sac and fluid are forming into protective cushioning for your baby.

pregnancy symptoms at 4 weeks
  • There's a chance you don't feel different at all yet, but brace yourself: nausea and vomiting may be in your near future.
  • Bloating, thanks to the pregnancy hormone, progesterone.
  • Mild cramping and bleeding. Don't worry -- this is totally normal as your baby implants himself to the wall of your uterus.
  • Mood swings, caused by your fluctuating hormones. These are most drastic during the first 12 weeks.

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

watch: your bump, week 4

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