Monster Update: 18

Head to bottom, the Monster is approximately 5 1/2 inches long (about the length of a large sweet potato (pictured)), and it weighs almost 7 ounces. The Monster is busy flexing its arms and legs — movements that Stef will hopefully start noticing. Myelin (a protective covering) is beginning to form around the Monster's nerves, a process that will continue for a year after birth. Oh, and genitalia (male or female) has been pretty much fully formed. We won't find out which kind until August 20th, though, so hurry up and vote in our poll.

Text adapted from Baby Center.