UCSF researchers discovered a molecular timer that gets activated in the first days of pregnancy and influences when mice give birth. A typical human pregnancy lasts 40 weeks, but most parents know ...

Background: Conventionally, the pregnancy duration is accepted to be 280-282 days. Fetuses determined by ultrasound biometry to be small in early pregnancy, have an increased risk of premature birth.

When it comes to the length of pregnancy, fetuses and those carrying them may have slightly different interests. Now, the largest study into how genes affect the timing of childbirth suggests that the ...