At what stage of pregnancy does labor typically begin?

Labor typically begins around 38 weeks of pregnancy. This timing correlates with what is known as full-term pregnancy, which is generally considered to range from 39 to 40 weeks. By this stage, the fetus is developed enough to survive outside the womb without requiring significant medical intervention.

While some women may go into labor a little earlier, around 36 weeks, this is generally considered preterm. Waiting until 40 weeks is also common, as some women may still be in labor during this period. However, the average onset of labor being most commonly around 38 weeks reflects a balance where the fetus is mature enough and the mother is also physically ready for childbirth.

The option of 42 weeks pertains to post-term pregnancies and typically indicates the end of a safe window for labor to start, as going beyond this point can increase risks for both the mother and baby. Therefore, the timing of around 38 weeks aligns with medical guidelines for when labor most commonly begins.