It is generally safe to sleep on your stomach during the first trimester of pregnancy when the baby is still small and protected by your pelvis. However, you should stop sleeping on your stomach by around 12 to 16 weeks (the beginning to middle of the second trimester) as your belly starts to grow and it becomes uncomfortable and potentially unsafe. By the third trimester, sleeping on your stomach is not recommended due to the size of your belly and the pressure it can put on your baby and internal organs. It is best to switch to sleeping on your side starting around 12 to 16 weeks and continue this position through the remainder of your pregnancy for comfort and safety.
