Your baby weighs approximately 10 1/2 ounces now and measures around 6 1/2 inches from head to bottom and 10 inches from head to heel – about the size of a banana. (You may wonder why you're seeing two length measurements this week. Until 20 weeks of pregnancy,babies are measured from the top of their head to their "rump." That's because their legs are curled up against their torso during the first half of pregnancy, so they're hard to measure. Starting next week, you'll see only the head-to-heel measurement.)
Your baby is swallowing more these days, which is good practice for the digestive system. He or she is also producing meconium, a black, sticky by-product of digestion. This gooey substance will accumulate in your baby's bowels, and you'll see it in that first soiled diaper. (Some babies pass meconium in the womb or during delivery).
