Dd 2.3 struggles badly with constipation which she holds in and has previously made her bleed. But the stools she passes aren't typical dark, little pebbles, sorry for TMI they are the size of tennis balls, so no wonder she holds it in :(. She has had movocol since a few months old but it doesn't do much, so have now been given lactulose. How does this work, are there any side effects or problems using it etc? Is it better than movocol or is there anything better if this doesn't work? We have tried the obvious diet changes, increased water intake, fibre etc, less dairy and even trialled soya for a while but with no change :(