Lifting baby while pregnant.

I know you’re not supposed to lift heavy things while you’re pregnant. What about my first baby? He’s going to be 2 in May and is still a little boy. He weighs about 35 pounds and I know you’re not supposed to lift anything over 10 to 15 but how could I deny picking him up and comforting him when he’s crying? Any other mamas pick up their first babies and have no problems? I don’t want to deny my son anything while we wait for his sibling