1st Trimester : Zygote implants into the uterus , Heart and nervous system form , Placenta forms to pass nutrients , Umbilical cord develops and is used for waste , Amniotic sac develops around baby for protection , Third Trimester: Fetus head moves towards vagina , Lungs develop , Opens and closes eyes, 2nd Trimester : Sex is evident , Taste buds develop , Fetus can dream , Most babies can suck their thumb ,

Embryo Development

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