DD's 18 months and for about the last month or so she hasn't passed a single 'solid' poo. Some of them are extremely watery but all are more or less runny. She's always had this when she's been teething which she was when it started and they had that tooth poo smell if you know what I mean. But the molars are all through now. She's not ill or off her food in particular and her bottom's not sore. Should I be worried? Nothing's changed in her diet or daily routine.