growth moves top to bottom

head down to feet

7.5 lbs and 20in average new born in the US

-4 months doubled weight

-1 year tripled weight

-2 years old growth slows and --> nearly 1/5 of adult weight  and --> nearly 1/2 of your adult hight (32-35 inches)

growth slows

-precentage of increase in height and weight decrease each year for preschoolers

-girls are only slighty smaller and lighter than boys

-slow and consistent growth

-2-3 inches each year

- muscle mass increases; bodyfat decreases

-improved muscle tone and strenght

-bones cont. to harden

growth spurt

 puberty

sexual maturation

menarche

amenorrhea

body images change 

hormones in girls and guys

androgens->male hormones

estrogens-> female hormones

secondary sex characteristics

Boys--> increased penis and testicle size, appearence of pubic hair, minor voice changes, 1st eiacuation,( usally during masturbation or wet dreams), on set of maxmum body growth of hair in arm pits

Girls--> breasts enlarge, pubic hair appears, arm pit hair, growth in height and hips get wider, first menstration occurs

girls first menstration rage 9-15/16 yrs, avg 12 yrs old

normal for first period to be irregular, might not ovulate during every cycle;  some girls arent fertile for 2 years after start period

- liptin: hormone released by fat cells when body has enough fat for repoduction 

girls are generally less happy than boys with their bodies

adolescents are preoccupied with thier bodies

early and late maturation- girls that develop early are shown to have low self esteem; boys that muture later in life have to develop personality vs skills

2 years earlier for girls than boys

-->avg. 9 yrs old for girls and 11 yrs for boys

-->girls increase in hip width, boys shoulder width