Sean as a baby had a perfect latch but not anymore. Not all the time but sometimes it's just really off. When he's on it feels like it the bottom...like his tongue is not over his bottom teeth. But then he unlatches and there are teeth marks on the top. It's so frustrating. He hates when I try to correct him. He just starts screaming and clamps on making it even harder to try to fix. If I unlatch him to try again, he cries and just tries to latch on how ever he can...usually worst than the first time. It's times like this that I'm glad he's weaning.