I give a whole prune. DS usually has one a day, he loves them and would eat a whole bag if I let him (which I DON'T). If he starts getting a bit too soft I hold off for a day or two, and offer carrots (although he won't eat carrots atm, he's off many veg atm actually!)
I made a right mess up yesterday though. Hadn't baked muffins in a while and had ripe bananas that needed using. Whipped up some muffins and in a strange moment of not really thinking about it I chopped up a load of prunes (got a bag on reduced price as they must be eaten this month) and chucked them in. The muffins were LOVELY.
We each had one, but then later on DP gave DS his afternoon snack and when he updated me it turned out it was another muffin! I then worked out there was the equivalent of two prunes per muffin!!!!!! Talk about laxative foods!
This morning he had the kind of poop you really don't want to see in the morning