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Pregnancy trimesters are commonly divided into three segments of about three months each, but their week lengths vary due to the total gestational period of approximately 40 weeks. The first trimester includes weeks 1 to 12, the second spans weeks 13 to 27, and the third covers weeks 28 to 40. This division reflects the significant developmental milestones that occur during each phase, rather than a strict week count. As a result, the first trimester has 13 weeks, while the other two trimesters have 14 weeks each, leading to a slight imbalance in their lengths.

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1w ago

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