LO is 13 weeks old and sleeps usually from 9p-4a and then feeds and goes back down until I get him up to leave for work. He wakes up and usually has a very wet diaper. He didn't feed for very long at his 9pm feeding last night, but I thought he was just getting more efficient. He slept straight through the night and my husband woke him up at 730. I went to change him and his diaper was completely dry. Would you be concerned??