DS (3-months) fills his nappy almost every 4 hours. We have to change him 3 times in the night just because he has wee'd so much it is completely full. The other night he 'wet the bed'!
He is in Size 3 Pampers new baby, I have tried the 12-hour sleep ones and the active fit and they don't make a difference. He is wearing the right size for his weight.