Dd1 was lactose intolerant she was throwing up from birth on both breastmilk and formula, it was only once she went onto lactose free formula at eight months that it stopped. She could eat cheese although she didn't like it and very small amounts of yoghurt to get some calcium and her formula had it too. It's a tricky thing to confirm, we were told she was just had reflux but looking back at photos she looked very sick and pale until we changed her diet.