Jack was fully TT day time around 2 1/4 but its only the last 3 mths he has gone without a night nappy, we decided to try earlier and he just wasn't ready then a few months back he asked to go to bed in jockies so we thought ok lets try adn we have only had maybe 1/2 dozen wet nights in 3 months he was just ready...I think wait a bit he'll let ya know when he is ready