" I just made it a routine after eating to sit on the toilet and they got a sticker. It takes some time but they quickly catch on. Before there were throw away diapers most kids were potty trained around 1, now kids walk around in diapers at 2-3 yrs.
If they have accidents later at night they might have a sleep rhythm problem, and then you can wake them every 2 hours for a few nights and take them potty and you will break the rhythm cycle that makes them not wake to go potty, "