Development stages of a baby.
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Development stages of a baby An average full term pregnancy consists of a nine month gestation period - approximately 280 days. The first three months are called the First Trimester. During the First Trimester, the baby develops all of its internal organs, the sense organs and the arms and legs. The Second Trimester is the fourth through the sixth months; the baby continues to develop during this time. The Third Trimester is the seventh month until birth; the baby finishes developing and gains the bulk of what will be the birth weight during this time. Immediately upon conception, cellular development begins. These cells become implanted in the uterine walls of the mother around five to nine days after fertilization. At approximately fourteen days, the expectant mother will miss her first period, but the pregnancy will not yet show up on a pregnancy test (the earliest a test will show up positive...

