My 18 month old has stopped wetting his nappy through the night. He is aware of when he is weeing/pooing but we don’t have a potty or anything so I’m not sure on his willingness to go outside of the nappy. Looked through older treads and can’t see any advice on starting an 18 month old. Is it possible to start too early and make it difficult later on if he’s not ready? If not how’s best to start?