Obstetrics
Deals with the management of pregnancy, labor and the first 28 days after birth
Prenatal development is divided into three calendar months called
Trimesters
During which trimester the developing organism is the most vulnerable to the effects of drugs, radiation, and microbes
First trimester
What sequence of events does pregnancy occur
1) fertilization 2) implantation 3) embryonic development 4) fetal development 5) birth about 38 or 40 weeks after the last menstrual period