Some babies are allergic to milk protein found in baby formula. Many infants who are allergic to cow's milk, present in many formulas, are also allergic to soy-based formulas. Switching to an amino-acid based formula is a safe solution for infants who experience an allergic reaction. An allergic reaction can be difficult to diagnose, as the symptoms may be subtle and vary greatly. Always visit with a pediatrician if an allergic reaction is suspected.
Before or After Feeding Time
Crying and fussiness immediately after starting or finishing a feeding are signs that baby is in discomfort and could be allergic to the formula used. Increased spitting up and excessive gas may be present. The baby may also vomit after the feeding.
Skin Condition
The skin may exhibit several signs of the allergy. A red rash with tiny bumps may be present. Dry scaly patches of skin, also referred to as eczema, may be present, especially near the forehead. A red ring may be present around the rectal area. The ring will not clear up after treating with zinc oxide.
Bowel Movements
Stool or bowel movements will appear abnormal---excessively loose or hard. Irregular color and odor will be present. Occasional diarrhea is normal in infants, but excessive loose stools appearing two to five times a day for several days is an abnormal occurrence.
Respiratory
Excessive sneezing, wheezing and mucous can be a sign of allergic reactions. Colds can be common for infants, yet excessive respiratory problems and mucous in the nose and throat on a regular basis are not normal.


