Your baby with the colic and excessive gas has the typical symptoms of a baby with lactose intolerance. This is not due to milk allergy, so neither of the formulas you mention will suit him. He should go onto a lactose free formula such as NAN LF or even a soya formula such as Isomil. Your other twin has the typical rash of seborrhoea, sometimes called seborrhoeic eczema. This is not an allergic condition and it will clear up by itself. He does not need a low allergy formula. He also does not have lactose intolerance,so he can use a normal formula
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