CLD 204 Lecture 1: CLD 204 – week four

• School: Ryerson University
• Department: Early Childhood Studies
• Course: CLD 204
• Professor: Rachel Caplan

Document Summary

The rate of growth from conception through infancy is unsurpassed throughout the rest of life. Conception: when the sperm and the egg meet. Pregnant: the zygotic implants itself in the uterine wall, first day of the last day of period. Mitosis: by four days, there are already 90 cells. Zygotic period: conception 1st week: diameter = 2. 5mm, 50% pf fertilized egg will spontaneously abort. Embryonic period: 2nd week 2nd months: ectoderm. Digestive system and respiratory system: differentiation, at-risk for congenital malformations. Weight: 6-8lbs: the female body determines when the fetus is ready to be born. Neonatal period: birth 4 weeks: body proportions, body weight: males 4% > females. Early infancy: 4 weeks 1 year: rapid gains in height and weight, weight triples by end of 1st year, length increases to about 76cm by 1st birthday. Later infancy: 12 months 24 months: growth: rapid but slower than 1st year, dimensions at 2nd birthday. Females: length = 86cm; weight = 26 lbs.