Pregnancy Snapshot
The first week
(Ages are referenced from time of conception. One month equals 4 weeks.)
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Pregnancy Pictures
 Development begins with a single-cell embryo at conception!!! (Age: 0 days)   One cell becomes two. (30 to 36 hours)  With 12 to 16 cells, the embryo is shaped like a tiny bunch of grapes. (3 days)  The site of the future back and chest can be seen. (4 days)  The embryo begins to implant in the womb. (6 days) | |
*All prenatal ages are referenced from the time of fertilization (or conception).
One month is defined as exactly four weeks.
