29 weeks

Your baby's brain is developing billions of neurons (important for later learning) at an amazing rate - no wonder her head is getting bigger now! To meet her nutritional demands - which peak this trimester - you'll need plenty of protein, vitamin C, folic acid, and iron. Her bones, in particular, are soaking up lots of calcium now, so drink your milk (or find another good source of calcium, like cheese or enriched orange juice). And get enough fiber in your diet to help prevent constipation, which can lead to hemorrhoids, a common occurrence in late pregnancy. Even if your belly button was an 'innie' before, it may become an 'outie' now.