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Preterm birth, also known as premature birth, is the birth of a baby at fewer than 37 weeks gestational age, as opposed to full-term delivery at approximately 40 weeks. [1] ...
The second trimester is defined as starting, between the beginning of week 13 (12 weeks +0 days of GA) [4] and beginning of week 15 (14 weeks + 0 days of GA). [37] It ends at the end of week 27 (26 weeks + 6 days of GA) [ 37 ] or end of week 28 (27 weeks + 6 days of GA).