growth of embryo week by week
Week 3 â Gestational Age (Fetal Development â Week 1) The embryo is going through a lot of basic growth at this time, with the beginning development of the brain, spinal cord, heart, and gastrointestinal tract. Week 4 & 5 â Gestational Age (Fetal Development â Weeks 2 & 3) Arm and leg buds are visible, but not clearly distinguishable.