At our ultrasound the other day the technician measured Lil Arroyo to be about a foot long and almost 1 lb! At week 22 his fingernails are almost fully grown and his organ systems are becoming more functional and specialized. He has a distinct pair of lips (we saw that on the ultrasounds!) and his first canines and molars are developing below his gum line. He looks like a miniature newborn! Blood is traveling through the umbilical cord at 4 miles an hour, fueling his growth with oxygen and nutrients. No wonder I'm tired!