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

12 Weeks Pregnant

Things are changing fast. You’re reaching the home stretch of the first trimester (we know, finally!) at 12 weeks which means your hormones are likely to tone things down a bit -- which might make you feel a little less emotional! And it will probably help the symptoms subside a bit, too. One warning though: your morning sickness and fatigue might get replaced by headaches and dizziness. But we think that’s a reasonable trade-off. The other big change? Baby’s almost done developing her body’s important systems and parts, which means, it’s mostly about getting bigger and more mature from here on out. Around week 12, you might want to know more about baby, so you’re probably having genetic testing done to determine her risk of birth defects or other problems. This can be a little scary -- and confusing -- so be sure to ask your OB plenty of questions, and know that it’s much more likely baby’s A-OK than anything else.

your baby's the size of a plum!
The average fetus at 12 weeks is about 2.1 inches long and .49 ounces. Now that she's got pretty much all her parts, her main job is to keep on growing.

your baby at 12 weeks
  • Most of her critical systems are fully formed!
  • She's about to enter the growth and maturation stage, in which her organs and tissues will grow and develop rapidly.
  • She's now developing her reflexes -- if you poke her body, she'll likely move.
  • She's opening and closing her fingers and curling her toes, too.
  • Her brain is developing fast!

pregnancy symptoms at 12 weeks

your must-do's
  • Schedule your monthly prenatal visit to the OB, if you haven't already.
  • Understand the signs of dehydration, or make sure you are sufficiently hydrated.

your nice-to-do's

watch: your bump, week 12

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