Hi .. I'm ihsa, I have twin daughters.They are 1 year and 2 month old. I find it difficult to potti train them. At first they would sit on the potti seat. but after some time ( particularly when they started to walk) they will get up from it and throw it away as if it was a toy. Nowadays they don't even sit it. They just throw it away. I really don't know what to do. Please give me some advice