PSY 260 Lecture Notes - Lecture 6: 18 Months
Document Summary
Lose several oz first few days, then gain oz/day for months. 2 year olds are roughly of their adult weight and of their adult height. Rapid changes in growth percentile - 20 percent in either direction - is a bad sign. Failure to thrive - serious medical issue in early infancy; baby does not gain weight as rapidly as they are expected to. Heart or lung problems, hormone problems, or genetic problems like down syndrome. Once blamed on parents, not nearly as much today. Newborns sleep 15 - 17 hours per day called rem sleep. By the first birthday 80% sleep through the night. Preterm babies sleep less than full term because they must eat every 2 hours. Cultural differences hugely impact various milestones in the first two years. New zealand 2 year olds average 13. 3 hrs/day. Japanese 2 years old average 11. 6 hrs/day. Co-sleeping - less than 20% in the u. s and canada; more than 70% in vietnam.
