My 9 mo DS has always gone a little red in the face at poo time but over the last 2 days he's almost purple and no poo comes out. He did manage to go yesterday but none today after a difficult night with thrushy bum and teething. Typical diet, porridge, organic apple and apricot cereal or weetabix for breakfast. Fish pie, veg sheperds, or pasta and spinach followed by fromage frais for lunch. Corn chowder or a soup for tea. Doesn't take mounds of milk anymore since stopping bf 3 weeks ago, perhaps 450-500ml a day of Hipp Organic and a full Tommee Tippee cup of water. Doesn't take fruit too easily and perhaps needs to drink more? I'm at a loss. HELP?