Never had any problems with constipation when he was in nappies, so I know it is in his head.
The problem is that he can go sometimes 3 days without a poo, and when it comes it's so big and solid that he is bleeding a lot from the straining and it's causing him quite a lot of stress.
I'm doing all I can think of to keep things moving - he has muesli or branflakes for breakfast, granary bread, big glass of smoothie in the morning. He is generally good with his fruit and veg.
Is there anything else that I can be doing? I'm thinking prune juice etc!