The doctor told my daughter that her baby is allergic to the milk she is drinking. He told her to eat tums, for the calcium, and drink lots of orange juice. She is a Board Certified Lactation Consultant, as well as a retired La Leche League Leader. Eczema is a condition where the skin becomes red and itchy, often beginning as a rosy rash on the cheeks. Babies at high-risk for atopic dermatitis have been found to greatly benefit from exclusive breastfeeding.
Allergies are less common in exclusively breastfed babies.
Remind her to check all food labels. If so, this may very well be playing a part in her baby's symptoms. While avoiding the use of dairy in her diet, it is actually more important to avoid the direct supplementation with formula that may be causing a direct allergic response or sensitivity in the baby. If supplementation is required she should speak with her baby's HCP about using a less allergenic formula, such as Nutramigen. Otherwise it may be very hard to tell if her dietary changes are making a difference.