Monster Update: 33

This week the Monster weighs a little over 4 pounds (the heft of a pineapple, pictured) and he has likely passed the 17-inch benchmark that all fetuses aim for. He's rapidly losing that wrinkled, alien look and his tiny monster skeleton is hardening. The bones in the Monster's skull aren't fused together, though, but that's a good thing which will make it easier for him to squeeze the birth canal. These bones won't entirely fuse until early adulthood, so they can grow as his brain and other tissue expands during infancy and childhood.

Text adapted from Baby Center.