Your poor little possum.

DS was 11 months when this started with him, he had a little tear which bled I was told by my GP to give him Lactulose. It's available over the counter from the chemist and you give them roughly 5mls I think. It helps draw moisture back into the stool to help it pass easily. Maybe speak to your Pharmacist tomorrow and see what they suggest?

Otherwise, there is always warm water and a belly rub that you could try. I hope it settles down soon.