When my oldest boy was about 11 months old, my wife left him home with me while she went out shopping with a couple of friends. She left me with instructions to check him and change his diaper as needed. When she returned some 4 hours later, his diaper was sagging with a full load, and she asked me why I hadn't changed him. My simple answer was.........the diaper said it was for 10 to 15 pounds, and I figured he had about 6 or 7 pounds to go.