Looking like a real baby this week...

Your baby now measures about 1 inch (2.5 cm) long from crown to rump. He or she is as big as a cherry or grape.

Overall, your baby is starting look more human now that the embryonic tail at the end of its spinal cord is nearly gone. All of the baby’s joints are working. It can make a fist and may even begin to suck its own thumb. And it’s starting to grow 10 tiny toes.

Gonads have become testes (for boys) or ovaries (for girls). Your baby’s digestive system also continues to develop. Its anus is forming and its intestines are growing longer.

The skeleton may begin ossifying as the bones form cartilage. Your baby has also started taking its first few drinks from amniotic fluid.

Other changes abound: Your baby's heart finishes dividing into four chambers, and the valves start to form – as do his or her tiny teeth. Your baby's organs, muscles, and nerves are kicking into gear. The eyes are fully formed, but the eyelids are fused shut and won't open until 27 weeks.

Your baby has tiny earlobes, and the mouth, nose, and nostrils are more distinct. Now that your baby's basic physiology is in place, he or she is poised for rapid weight gain.