My 2.5 year old daughter is very healthy and happy, has a fantastic appetite and eats anything I put in front her. But she has suffered since birth from chronic, painful constipation. She was treated with Lactulose, but we stopped giving it to her, as she is now passing very soft stools. However, they have turned orange/yellow in colour and when we undo her nappy the smell comes out and it actually makes the eyes water (no exaggeration). It smells like ammonia, and she has a very bloated stomach at the end of the day. Any ideas what is causing this???