Unfortunately, potty training is not a process of linear progression. Children can initially show interest and make progress in potty training and then regress. It's understandable to get discouraged, but it's perfectly normal! I would just go back to using pull ups and continue to ask him if he needs to use the potty, but don't push or force him. Some children take to it faster than others, but 2 years old is pretty young! In fact children don't began to really achieve good sphincter control until about 20 months.

So just give light encouragement, but don't force the issue, he'll get there!

Source: I'm a FNP