Pregnancy is a period of development and changes that occur inside a woman’s body. The first trimester is a critical time during pregnancy. This is when the embryo, now known as the fetus, develops rapidly. By the end of this period, it weighs about 0.5 to 1 ounce and is three to four inches long. In this time, the fetus will begin to develop its neural tube, which will become the baby’s brain. It will also begin to develop the circulatory system and develop eyes and ears.
The second trimester lasts from weeks thirteen to 28. It is during this time that morning sickness usually starts to ease. However, some women may experience back or leg cramps and constipation during this period. Also, the first fetal movements will be felt during this time. If you are a first-time mother, it is a good idea to take birth control or contraception during this time.
Pregnancy is a natural process that can last for up to 40 weeks. The baby’s development begins at conception and progresses through three trimesters. Each trimester has its own unique challenges and risks. A full-term pregnancy lasts around 40 weeks. You can learn more about each trimester at the Office on Women’s Health.
After conception, the zygote moves down the fallopian tube toward the uterus. It then divides into 16 cells, known as blastocysts. The blastocyst burrows into the lining of the uterus and begins to develop. The baby’s intestines, brain, and digestive system will begin to form.
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