Pregnancy Snapshot

2 to

3 weeks pregnant

For a brief summary of development events during various
stages of pregnancy, choose any age* range from the drop-down menu.

(*Ages are referenced from time of conception or fertilization,
not from the beginning of your last menstrual period. One month equals 4 weeks.)

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Movie clip from The Biology of Prenatal Development. Buy Now!


The brain has three major divisions. (3 wks) The heart is shaped like a long tube. (3 wks) • Blood cell precursors are appearing in the yolk sac. • The early heart can be seen. (20 days) • Blood cells and blood vessels are forming. (3 wks)

*All prenatal ages are referenced from the time of fertilization (or conception).
One month is defined as exactly four weeks.