Prenatal Development Timeline

Start of First Trimester

Jan 1, 2017

Period of the Zygote

Period: Jan 1, 2017 to Jan 14, 2017

Period of the Embryo

Period: Jan 15, 2017 to Feb 25, 2017

Period of the Fetus

Period: Feb 26, 2017 to Oct 1, 2017

Start of Second Trimester

Mar 26, 2017

Week of sex detection- Week 18

May 1, 2017

Week of viable birth- 24 weeks

Jun 11, 2017

Start of Third Trimester

Jul 2, 2017

Full term pregnancy- 40 weeks

Oct 1, 2017