Yes! DD1 was always a chucker, she was breastfed but got a lot of teeth at 8 months and was biting so she went onto formula. She refused to breastfeed after she stopped teething and would only take the formula, she stopped chucking until we introduced her to yoghurt and cows milk. Then we realised she was lactose intolerant and that she must have known she felt better off it.