My 5 month son is constipated, suggestions?

You could try mixing a little fruit with his cereal...My doctor told me anything that starts with a P will make them poop....Peaches, prunes, pears, etc. Just a jar of baby food...Mix that in and see if that works. You could also try a little bit of fruit juice, diluted with water. Just make sure it's 100% juice, probably apple juice....And just give like 2-3 oz. Good luck, I know it's hard when they're uncomfortable :(