My little man did this and we tried everything. Ended up onlu huggies supreme would contain him at night. So owe used pampers during the day and supreme at night. Then when he was doing better we switched to pampers again. Lasted well for a while then right before we needed to move to the next size he started leaking again. Now we use Pampers cruisers. He started leaking out the sides during the day, until we made this last switch. Good luck. My son also would only sleep on his tummy and with major reflux I was sooo nervous that when he began sleeping through the night I would check on him all the time.