Human Growth 4

A body weight at birth of less than 3 pounds, 5 ounces (1,500 grams) p.110

An image of a fetus produced by using high-fequency sound waves. p.92

A situation in which a certain teratogen is relatively harmless in small doses but becomes harmful once exposure reaches a certain level. p.103

Agents and conditions, including viruses, drugs, and chemicals, that can impair prenatal development and result in birth defects or even death. p.102

A term for a baby whose birthweight is significantly lower than expected given the time since conception.

An unlearned, involuntary action or movement that responds to a stimulus. p.113

A birth that occurs 3 or more weeks before the full 38 weeks of the typical pregnancy p.111

A new mother's feelings of inadequacy and sadness in the days and weeks after giving birth. p.116

The strong, loving connection that forms as parents hold, examine, and feed their newborn. p.116

Cooperation between a mother and a father based on their mutual commitment to their children. p.116

A body weight at birth of less than 5 1/2 pounds. p.110

A form of newborn vare in which mothers (sometimes fathers) rest the baby between their breasts, like a kangaroo that carries her immature newborn in a pouch on her abdomen. p.117

The process, beginning about 10 days after conception, in which the developing organism burrows into the placenta that lines the uterus, where it can be nourished and protected as it continues to develop. p.90

The first 2 weeks of prenatal development after conception, characterized by rapid cell division and the beginning of cell differentiation. p.89

The name for a developing human organism from the start of the 9th week after conception until birth. p.92