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Friday, May 1, 2009

Refresh my Biology...

Timeline of human foetal development







Day 1 : fertilisation

Day 6-9 : implantation into mother's uterus
















Week 2 : 3 layers of cells - ectoderm, mesoderm and endoderm are formed





















Week 3 : rudimentary heart beating














Week 8 : unborn embryo called a foetus







Week 19 : minimum age for a baby to be born and survive


Week 38 : baby ready to be born, lungs are fully functional

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