* Human infants recognize their mother's voice, as suggested by the reading of books, during the last 5 to 6 weeks of pregnancy.
* Newborns' vision ranges from 20/300 to 20/800, but reaches 20/20 by 6 to 8 months after birth.
* Newborns can focus on objects 8-10 inches away and are more responsive to certain stimuli.
* Taste and smell receptors are functioning by the 4th month of prenatal development.
* Babies even a few hours old respond to sour, bitter, and sweet substances similar to adults.