Monster Update: 23

The Tummy Monster is more than 11 inches long and weighs just over a pound. He may be able to feel Stef's movements now. He looks red now due to blood vessels showing through his transparent skin, but his true skin tone will develop over the course of his first year. Blood vessels in the Monster's lungs are developing to prepare him for breathing, but complete lung development will take many more months. The lungs are the last organ to fully develop.

Text adapted from Baby Center.