Chapter 3 Learning ObjectivesLO1How does physical growth of the body and nervous system proceed during infancy?Infants grow at a rapid pace over the first 2 years. By 5 months, the infant's birth weight doubles and by age 1, the weight has tripled to 22 lbs. At the end of his or her 2nd birthday, the child is about quadruple the birthweight.Infants are born with roughly 100-200 billion neurons. At birth, an infant's brain has relatively few connections to other neurons. During the first 2 years, a baby's brain will establish billions of new connections between neurons and becomes increasingly complex.LO2How are the bodily systems integrated during infancy?One of the most important ways that behavior becomes integrated is the the development of various rhythms, which is repetitive, cyclical patterns of behavior. Some are more obvious (breathing and sucking patterns) and some are more subtle (jerking legs).LO3What are the sleep patterns of infants?On average, newborn infants sleep some 16-17 hours a day (varies between 10-20.) Most babies do not sleep through the night for several months.States:Awake- AlertNon-alert wakingFussCryTransition Between Sleep and Waking- DrowseDazeSleep-wake transitionSleep States - Active SleepQuiet SleepTransitional Sleep States - Active-Quiet transition sleepLO4What are the major reflexes?