Jacob is 21 weeks today!

White blood cells are under production. Leukocytes (or white blood cells) form our body's defense systems. They help fight infections and diseases.

Your little one's skin has changed from translucent to become more opaque.

Your infant's tongue is fully formed. If you were able to peek you might catch your son practicing giving you a raspberry (ouch)!

Baby swallows more this week. After your baby takes in amniotic fluid, his body absorbs the water in the liquid and moves the rest into the large bowel. This is good practice for his digestive system!

Wake and sleep periods become more consistent. Some research suggests that baby sets his internal clock to match the outside world's even before birth! Your eating and sleeping habits as well levels of light and noise serve as his signals. (that is just too interesting! See, my baby is getting on a schedule already!)

Baby measures about 10.51 inches and weighs nearly 12.7 ounces. (the baby weighed 12oz at our sonogram last week)