My doc said try not to lift more than 20 pounds
My son almost weighs 40 pounds and I was told that it is still ok to lift him as long as I don't have any cramps or anything. I haul this heavy little butt up and down 18 stair just to get up to my condo! I know he is way to heavy to carry anyways lol :)
my son weighs 29 pounds and i am always carrying him there is no problem with what you did, so dont you worry about it