DD (15 months, 20lbs, 29 inches tall) keeps leaking through diapers. She has leaked through a diaper during two naps in the past two weeks (changed right before she goes down) and leaks through her diaper almost every night. She wears size 3 during the day, Target brand, so I think I am just going to attribute those leaks to the changes they made recently. She was wearing Pampers overnights size 3, so we changed those to 4 last night and she was soaked this morning. So it doesn't seem like a size thing. I am planning on eliminating water two hours before bed. Any other suggestions on how to stop the leaks?