Hi everyone. My DS, (9 months) exclusively breastfed is cutting his 6th tooth and has rejected my boob for the last 48 hours. In desperation last night I offered him cows milk and again this morning - which he guzzled down and loved. He eats loads of cheese and yog, veg, fish etc. Is it really detrimental to his health if I continue with cow's milk so early? He's never been keen on formula and the few times I have tried to express in the past have been a disaster.