My 19 month old has been wearing a size 6 overnight diaper because he does pee more at night. He sleeps from about 8:00 PM to 8:00 AM but has been waking up early because he is wet. He wears a size 5 during the day, we started using the bigger size 6 at night to help but now that is too small. He is a very tall kid and I'm not sure what to do. He is not ready for potty and he is solidly a size 2T in clothes and the Goodnights seem like they are for ages 4 & up. Any suggestions?