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Trimesters of Development (2nd Trimester (Period of growth, Fetal…
Trimesters of Development
1st Trimester
Tissues, organs, organ systems develop
Embryo is affected by alcohol, tobacco, drugs and other factors
A mother might not realize she is pregnant during the first two weeks since she didn't miss on a menstrual cycle yet
After 8 weeks the embryo is called a fetus and all organs have began to form
By the end of this trimester, the fetus can move arms, fingers, etc and make facial expressions
2nd Trimester
Period of growth
Fetal heartbeat could be heard after 18-20 weeks
Fetus is now capable of sucking thumb and developing hiccups
Hair forms and eyes open
At the end of this trimester, the fetus is able to survive outside of the mother's uterus. However the baby cannot maintain a constant body temperature
Lungs and immune system not fully developed
3rd Trimester
Fetus continues to grow
Fat accumulates under skin to provide insulation
Protein taken by the mother is important for the full development of the baby's brain
Fetus is capable of responding to sounds
