Throughout this review, assume that all variables represent positive real numbers. Find

8/31/16 Human Growth and Development Chapter 3­ The First Years: Body and Mind • Growth in Infancy ­ body size • average weight ­ birth: 7.5 lbs ­ 24 months: 24 lbs • average length ­ birth: 20 in ­ 24 months: 34 in • Sleep ­ newborns sleep about 15­17 hours a day, in 1­3 hour segments ­ newborns’ sleep is primarily active sleep ­ newborns have a high proportion if REM sleep ­ co­sleep or bed share • Brain Basics ­ neuron • one of billions of nerve cells in the central nervous system (CNS) ­ axon • fiber that extends from a neuron and transmits electrochemical impulses from that neuron to the dendrites of other