Despite extensive research themselves the cheapest! To my son of 13 months we use pampers since birth and simply dry since its 3-4mois ... With us no leakage at night they take the shock well knowing we put him in the evening around 19h30-20h overnight 7 am-7:30. And during the day except for two or three memorable leaks 10mth Soucy no. We are very satisfied and have no intention of changing!