you can go for formula milk consumption for your child after medical consultation with your dr. you can go for any brand which is easily digestible by the child but if the child is not able to digest and has colic pain vomiting and loose motion or constipation due to a particular formula milk it is advisable to change the brand. also if one brand is going on it is advisable to continue the same brand and do not switch to different brands again and again because many times it can lead to digestion problem. so if a particular brand is well digested kindly continue that particular brand of formula milk you have to follow demand feeding that is if the child demands more milk you can gradually increase the quantity .