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Pregnancy is the development of one or more offspring known as an embryo or fetus inside woman's uterus. The length of pregnancy is generally about 40 weeks from the start of the last normal menstrual period which includes 2 weeks before conception.
Human pregnancy is arbitrarily divided into three trimester periods of three months each, as a means to simplify reference to the different stages of prenatal development. This corresponds to about 40 weeks from the start of the last menstrual period or about 9 months.
Below chart shows the division of trimesters, pregnancy months and weeks and important fetal development in that period.
» First Trimester
» Second Trimester
» Third Trimester
|Fetal Growth in ...|
|1st month||2nd month||3rd month||4th month|
|5th month||6th month||7th month||8th month|
|9th month||10th month|