LO recently learned how to sit up on his own, and today, he's been sitting up in his crib once I lay him down for a nap. Do I keep going in and laying him down or do I just leave him? How long would you leave him for? he's not fussing when he's sitting up, he's just kind of chilling/playing. And he is definitely tired as he fell asleep nursing right before I put him in the crib.