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Turns from stomach to side
Infants usually double their birth weight in about five months and triple it by one year. -
Turns from stomach to back
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Turns from back to stomach
many babies can grab and shake toys. -
Sits
infants develop specific attachments to their main caregivers—usually their mothers. -
Crawls
Some kids pick up small objects between their thumb and index finger. Others will begin to show signs of right- or left-handedness -
Kneels
Some infants develop a fear of strangers. This fear is known as stranger anxiety. -
Stands
they may stack blocks or turn the pages of a book. -
Walks
They grow about 10 inches in height in the first year. Children gain on average two to three inches and four to six pounds each year until they reach the start of adolescence. -
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Early Adolescence
Peer pressure is relatively weak, but it increases in middle adolescence, peaking at about the age of 15. Then, however, peer pressure seems to decrease after the age of 17. Adolescents place themselves in situations where they will probably meet peers of the other sex -
Period: to
Middle Adolescence
age from 9 to 15 carried electronic pagers for a week so that when signaled they could report to researchers what they were doing and with whom. The study showed that the older the children were, the less time they spent with their families. Adolescents participate in group dating, such as joining a mixed group at the movies. -
Period: to
Late Adolescence
They may pair off as couples for traditional dating. Relationships tend to be more stable and committed -
Period: to
Young Adulthood
Covers a span of approximately 20 years from about age 20 to about age 40. Most people reach their physical peak in their 20s. During their 20s and early 30s, they are faster, stronger, better coordinated, and have more endurance than they have ever had or will ever have again. -
Period: to
Middle Adulthood
Middle adulthood spans the years from 40 to 65. By age 40, most people have begun to lose some of the strength, coordination, and stamina they had in their 20s and 30s. This decline is generally so gradual that it is hardly noticeable. -
Period: to
Late Adulthood
Age 65 marks the beginning of late adulthood.Many physical changes take place in late adulthood. Wrinkles and skin folds appear as the skin becomes less elastic. Some of the senses become less sharp. In general, older people do not see and hear as well as younger people. A decline in the sense of smell leads many older people to add more spices to their food for flavor. The reflexes and the reaction time of older people also tend to be a little slower than those of younger people.
