The general rule of thumb is to avoid lifting any heavy objects. Women who are at risk for premature labor may need to stop lifting objects after the first trimester. Future moms may also be discouraged to lift heavy objects if they have pregnancy complications such as bleeding or early contractions. For most women, carrying a toddler while pregnant with baby number two is totally fine. But there's a trick to it that you should know: When you do pick him up, lift with your legs so you don't strain your back in the process. You'll probably be most comfortable holding him on your hip, below your bump.