how many weeks is full term pregnancy

A full-term pregnancy is typically about 40 weeks long, counted from the first day of the last menstrual period. More precisely, a baby born between 39 weeks, 0 days and 40 weeks, 6 days is considered full term. Babies born before 37 weeks are considered preterm, and those born after 42 weeks are post-term. The pregnancy is usually divided into three trimesters: first trimester (weeks 1-12), second trimester (weeks 13-26), and third trimester (weeks 27-40).