Many women experience a shrinking appetite in the third trimester, mainly because there's just not much room left in the belly. But, healthy eating is essential right now — the final months of pregnancy are dedicated to intensive fetal growth. In fact, most babies gain half their weight during this period. One way to get the nutrients you need without stuffing your already-full belly is by eating small meals and snacks throughout the day. Check with your doctor if you're seriously concerned, but as long as you’re on track to gain a healthy amount of weight, there's not much reason to worry.