8 Weeks

Baby Center update: Your babies are now 5/8 of an inch long, about the size of a kidney bean. New this week: Webbed fingers and toes are poking out from your babies' hands and feet, their eyelids practically cover their eyes, breathing tubes extend from their throats to the branches of their developing lungs, and their "tails" are just about gone. Their arms have lengthened, too, and their hands are now flexed at the wrist and meet over their hearts. Their knee joints have formed, and their feet may be long enough to meet in front of their bodies. In their brains, nerve cells are branching out to connect with one another, forming primitive neural pathways.

According to The Bump: Your babies are growing like mad, putting on about a millimeter every day and continuing to straighten out in the trunk. Though you can't feel it yet, the babies are moving those little arms, legs and (now only slightly) webbed fingers and toes like crazy.