At 14 motnhs DS transitioned from 2 sleeps a day to 1. It took a while to transition to just one sleep as he would be extremely tired all day, but eventually he got there, now he just has 1 2-3 hour sleep per day. For a while there he would have two days of having 1 sleep then one day of 2 sleeps to catch up, they sort it out themselves, you just have to be patient and hope they srt themselves out sooner rather than later. GL