Hi My son is almost four years old. He does potty on his potty seat which I put on the pot. The seat at my house is square shapes from the front. Now I have come to my mother’s place. Here the seat is round from the front. His potty seat does not fix well. Now he is not doing potty on it. I have tried many times . He is so rigid. What should I do ? He does every time when I go out at my mother’s place or any hotel in vacations also. I am worried.