2 Timeline of Fetal Development Day 1: Conception takes placeDays 7-14: Fertilized Egg Implants in the Wall of the Mother’s UterusDays 1-14 = Period of the Zygote ***“Zygote” means fertilized egg
3 Timeline of Fetal Development Day 18: Heart begins to beatDay 21: Pumps own blood through separate closed circulatory system with its own blood typeDay 28: Eye, ear and respiratory system begins to form
4 3 Stages of Fetal Development: ZYGOTE EMBRYO FETUS
5 Period of the zygote Conception (Day 1) Two Weeks Fertilized Egg is Implanted in the Wall of the Mother’s Uterus (~ Day 14)Two WeeksZygote grows to be about the size of a pin head
6 Period of the Embryo 6 Weeks 2 Weeks After Conception 2 Months After Conception6 Weeks*All Organs form*Attachment of Umbilical Cord to uterus*Amniotic Sac & Fluid formed
7 From the End of the 2nd Month of Pregnancy Period of the fetusFrom the End of the 2nd Month of PregnancyBIRTH8 Months
11 Two MonthsThe embryo is about ¼” inch long and has distinct, slightly webbed fingers.Veins are clearly visible.The heart has divided into right and left chambers.Bones begin to formDevelopment of internal organsThe embryo is attached to the mother by the umbilical cord.
21 Eight MonthsYour baby is gaining about half a pound per week, and layers of fat are piling on.He has probably turned head-down in preparation for birth.Fetus may react to noise with jerking actions.
23 Nine MonthsYour baby is a hefty 6 to 9 pounds and measures between 19 and 22 inches. As he becomes more crowded, you may feel him move around less.Disease-fighting antibodies are taken in from mother’s bloodFetus “drops” into the pelvis and is ready for birth
24 Pregnancy is Broken Up into Trimesters FIRST Trimester (1-3 Months)Ovum (a female egg)Zygotic & Embryonic period of Fetal DevelopmentWhen all organs, nerve and brain cells developSECOND Trimester (4-6 Months)“Golden Trimester” when Mother feels the bestTHIRD Trimester (7-9 Months)Baby’s organs and body systems matureBaby gains weight