We had issues with diapers leaking toward the early morning when my son was in size two diapers because he would sleep in bed with me and nurse throughout the night. When he was in size one, we were changing him throughout the night because he woke up several times, but once he started sleeping through the night for the most part, the leaks were a big problem! As soon as he was big enough to wear size three diapers, we tried these and they was a huge success! They completely solved the leak problem! And they are still comfortable for my son, not too bulky or stiff. Now, months later, my son sleeps in his own crib, no longer nursing in the middle of the night, but we still use these diapers, just in case, because so many of my friends complain about leaky night time diapers - that is until I make them try these diapers. My sister-in-law was complaining that her daughter wakes up wet in the middle of the night, so I told her to try these and they solved her problem too! Great product, couldn't live without them!