This week, brown fat begins to form near the base of Justin's neck, near his breastbone, and near the urethra. Brown fat keeps the baby's body warm in cold environments, and is present in newborns but only very tiny amounts remain into adulthood.  Justin's eyebrows will begin to form this week and should be visible by 20 weeks.  His "permanent" hair (not down/lanugo) is going to form on his head this week.  Following birth, this hair will get gradually coarser and thicker as it falls out and is replaced.

His sleep/wake schedule is very similar now to what a newborn's is.