If a pregnant woman who might develop high blood pressure exercises at a moderate pace, it won't make her baby smaller — so it's safe for the baby's growth.

If pregnant women who are at moderate risk for high blood pressure do more physical activity each week, their babies tend to be born later and weigh more at birth, which might help the baby grow healthier without becoming too big.

If pregnant women at moderate risk for high blood pressure do regular, supervised workouts like walking, lifting light weights, or a mix of both, three times a week, it won’t make them more likely to have their baby too early.

Pregnant women who exercise more each week tend to have babies with higher birthweights, even when you account for how long the pregnancy lasted. It’s not just about going longer—it seems like exercise itself might help the baby grow bigger.

Pregnant women who exercise more during pregnancy—like walking or swimming a lot—tend to have lower blood pressure in the last few months of pregnancy, which might help keep their hearts healthier.

Working out while pregnant doesn't make it more likely for a mom to lose the baby, have the baby too early, or have a baby with low weight — it's generally safe for most pregnant women.