Prenatal Development By Doris Clarence Period: Jan 1, 2017 to Jan 11, 2017 Zygote First two weeks Period: Jan 1, 2017 to Feb 19, 2017 First Trimester week 1 through week 12 Period: Jan 21, 2017 to Jan 31, 2017 Embryo Week 3-8 Period: Jan 31, 2017 to Feb 10, 2017 Fetus 9th week - birth Period: Feb 19, 2017 to Jun 18, 2017 2nd Trimester week 13 to week 27 Apr 30, 2017 Week of detection 18-20 weeks May 28, 2017 week of Viable Birth 23 weeks Period: Jun 19, 2017 to Sep 3, 2017 Third trimester week 28 to the birth Sep 17, 2017 Full Term Pregnancy 39 weeks
