<s>[INST] my daugther is 2.5 yeras old... now a days she is constipated and her poop is dark brown in color..... she has been dring milk with noproblem all these days but off late she gets diahorea when i give her whole or 2% milk..... wonder if she is lactose intolerant..kindly help [/INST] HelloConstipation is a fairly common problem at this age because of habits like less intake of fluids, inadequate toilet training and fear of using the toilet.However, if you have to rule out organic causes is she thriving well-her weight and height -if that's normal lactose intolerance less likely and even so primary is less likely at this age. Give her -plenty of fruits and vegetables, less of biscuits and maidatoilet train her for morning hours as that's when our body reflex is trying to eliminate stools. I would say observe her with above measures if she is growing well !! </s>