Mine leak a bit, and bunch up, but I think they are a bit too big for DS. I have also heard that the red ones are notorious for leaking, not sure why. I use them all the time at home tho, the trouble I'm having at the moment, is that DS likes to sleep on his tummy, so is leaking out the front. I might try adding the booster during the day, and if that works for me I will get some more boosters