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The organs mature.
During the 4th month, the first month of the second trimester, the greatest amount of fetal growth occurs.
Increases in length
The stages of fetal growth and development are divided into three trimesters. During the first trimester, major organs begin to form. In the second trimester, the fetus grows rapidly, becomes more active, and the organs continue to develop. The third trimester is characterized by further growth and development, as well as the maturation of the fetus's organs in preparation for birth.
Its ok during the first trimester where growth and development of brain is very important.
The traditional designations are: During the first trimester - abortion (spontaneous abortion, if you want to avoid ambiguity) During the second trimester - miscarriage During the third trimester - stillbirth
Some people gain no weight during the first trimester, particularly if they have morning sickness. Other people gain a small amount, particularly towards the end of the first trimester. The most weight is gained during the second trimester though.
The first trimester is most critical for the development of a baby. The babies brain is formed during the first trimester.
a baby
to keep the union together. he didn't really want to free the slaves
The third trimester starts at week 28, or 7 months into the pregnancy.
Brain development, lung maturation and overall growth are the main changes in the last trimester.