By the end of week four, the child is ten thousand times larger than the fertilized egg.
Week 5: Eyes, legs, and hands begin to develop.
Week 6: Brain waves are detectable; mouth and lips are present; fingernails are forming.
Week 7: Eyelids, and toes form, nose distinct. The baby is kicking and swimming.
Week 8: Every organ is in place, bones begin to replace cartilage, and fingerprints begin to form. By the 8th week the baby can begin to hear.
If you break embryonic and fetal development into thirds then when you are in your 28th week the baby begins its final third of development. (Gestation is 266 days or 38 weeks of development). So either way you look at it you are in your 3rd trimester!
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