What is the shortest time someone has been pregnant before giving birth?

The shortest recorded time for a pregnancy before giving birth is about 21 weeks and 4 days. This record was set by a baby born in 2006, who was delivered extremely prematurely due to serious health issues. Generally, pregnancies are considered full-term at around 39 to 40 weeks. Babies born before 24 weeks often face significant health challenges and have very low survival rates.