-
Start period of the zygote
The period of the zygote is quite brief, lasting for about four days. Around the fifth day, the mass of cells becomes known as a blastocyst. The germinal period will last approximately fourteen days, after which the embryonic period will begin -
End period of the zygote
-
Start period of embryo
-
End period of the embryo
-
Start of the fetus
-
End of the fetus
-
first trimester
-
second trimester
-
Third trimester
-
week of sex detection
-
week of viable birth
-
Full term pregnancy