Hi Robin,

There is a condition known as galactasemia where the baby is unable to process human milk. This is usually diagnosed at birth. Other than that there has never been a documented case of a baby with true allergy to mother's milk. There are documented cases of the baby reacting to certain things mother ate that end up in her milk. Bovine protein (beef, veal, cheeze, milk) is number one but brocolli, beans, soya lecithin, and several others can also be at issue.

How old is your baby at this point? It's also possible that your milk supply is not maximized yet and baby could simply still be hungry. A baby with gas is fairly easy to burp. A hungry baby is another story.

Frozen milk poses another issue. Sometime the lactase enzyme in frozen milk causes a breakdown of milk products that can cause a fussy baby. One way to deal with this is to scald the milk on the stove before bagging it and freezing it. This gets rid of the enzyme and seems to lessen its effect. If milk is already frozen (ie from a donor) you can scald before serving to baby but be sure to let the milk cool sufficiently before feeding to baby. You can scald it and then put the pot in an ice bath using frozen gel packs in a sink filled with cold water.

Fondly,