Week 16

Baby now measures about 4.3 to 4.6 inches from crown to rump and weighs about 2.8 ounces. Fingernails are well-formed and the fine hair, called lanugo, continues to grow on the head. Arms and legs are moving, the nervous system is functioning and muscles are responding to stimulation from your baby's brain. Within the next few weeks you may start to feel your baby move, called "quickening." Source: WebMd.com