Only one of mine was trained before 3 y/o, the others kind of dawdled around the issue (go on the toilet every other time
). The majority of them were trained by 3 yrs 2 mon. I did end up putting a few back in diapers because they were so challenging
. However, I finally got fed up and told them "at the end of this pack 'we' are only wearing underwear - day and night!!! It took about a week and it's been fine ever since. Though it seems the boys tend to get more distracted and then have to make a run for the bathroom at the last minute.