DS is 2 years 2 months and started to become interested in potty training. We bought a potty for him, but he is a big boy and it is far too small. So then we bought one of those inserts that go on the toilet but he really seems to 'stick out' of it and the only time he's used it so far the wee went everywhere! I try to keep telling him to 'tuck himself in' but is there any better way?