Week 28

This week marks an important milestone for Baby's brain development. Until now, the surface of your baby's developing brain was smooth. During this week, Baby's brain begins to form its characteristic grooves and indentations, allowing the brain’s surface to expand while it develops within Baby's tiny skull. At about two pounds four ounces and 13.8 inches from head to toe, your baby has certainly come a long way!
Other important developmental advances continue as well:
* Baby will continue to add layers of fat under her skin, and will get plumper with each passing day.
* Hair on Baby's head will continue to grow.
* A boy's testes are usually completely descended into the scrotum by this point.
* Baby's lungs are now capable of breathing air. (verybestbaby.com)