5 Questions
What is the average length of a pregnancy?
40 weeks
During which trimester do the fetus's major organs begin to form?
First trimester
At what stage does the fetus begin to double in size and the mother can feel its movements?
Second trimester
What is the period called when the sperm meets the egg and the zygote forms?
Fertilization
What happens when labor begins during the third trimester?
Cervix dilation
Study Notes
- Human body's remarkable capability: the development of life in utero
- Three million babies born annually in the US, highest fertility rate in Niger (6.49 children per woman)
- Pregnancy: period when fetus develops inside the womb, typically lasts 40 weeks, divided into three trimesters
- Fertilization: sperm meets egg, zygote forms, implants on uterine wall, placenta develops
- First trimester: zygote divides, brain makes up nearly half of embryo, eyes, nose, ears, and major organs begin to form
- Second trimester: fetus more than doubles in size, hearing develops, movements felt by mother
- Third trimester: fetus gains nearly half a pound a week, major development complete, bones harden, labor begins with cervix dilation
- Scientific understanding of pregnancy has increased, leading to more success and safety for mother and child
- Reproductive medicine and technology continue to advance, promising more for the future of pregnancy.
Explore the remarkable development of life in utero and the stages of pregnancy, from fertilization to the third trimester. Learn how scientific understanding and reproductive technology have improved the success and safety of pregnancy for mother and child.
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