Week 10

"Your baby measures about 1 1/4 to 1 2/3 inches (31 to 42 mm) from crown to rump, and weighs about 1/5 oz (5 g).

Your baby switches from being an embryo to a fetus -- which means 'little one' -- this week. His brain has grown so much by now that his head still looks too big for the rest of his body. His eyes and nose are clearly visible. Twenty tiny baby tooth buds are forming in his gums.

Your baby's wrists and ankles have formed by now, and you can make out fingers and toes. Most of his joints are formed. Genitals have begun to form, but it's too early to distinguish the sex.

Your baby's nervous system is responsive and many of his internal organs begin to function. His lungs continue to develop, and his stomach and intestines are developing in his abdomen. His kidneys are moving into their final positions in the upper abdomen, and his heart is almost completely developed."

- from "The Pregnancy Bible" by J. Stone and K. Eddleman