Embryo Development to 5 Day Blastocyst

Day 0: The sperm enters the egg to fertilize them.

Day 1: Eggs that fertilize show 2 pronuclei in the center of the egg.

Day 2: The cells have divided and are embryos are now between 2-4 cells.

Day 3: Cells have continued dividing and are between 6-8 cells using maternal DNA. Paternal DNA kicks in and impacts development

Day 4: The embryo is in "morula" stage and has more than 10 cells that have begun to compact and fuse together.

Day 5/6: The compacting cells of the morula begin to form into a "Blastocyst" with an outer circle called the Trophectoderm and an Inner Cell Mass.

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