**Core Concept**
Breastfeeding and allergy transmission: Breast milk does not contain enough intact protein to cause an allergic reaction in infants of mothers with protein allergies. The immune system of the infant also plays a crucial role in preventing the transmission of allergies through breast milk.

**Why the Correct Answer is Right**
Protein allergies occur when the immune system mistakenly identifies a protein as harmful and mounts an immune response against it. In breastfeeding, the protein content in breast milk is relatively low, and the proteins present are often broken down into smaller peptides, making it less likely for the infant to develop an allergy. Additionally, the infant's immune system is still developing, and this process helps to prevent the transmission of allergies. The mother's protein allergy will not be transmitted to the infant through breast milk.

**Why Each Wrong Option is Incorrect**
**Option B:** While consulting a primary health care provider is always a good idea, it's not necessary in this scenario as breastfeeding is not contraindicated in mothers with protein allergies.
**Option C:** Formula milk is not necessary to avoid allergies in this case, as breastfeeding is unlikely to transmit the allergy.
**Option D:** Alternating between breast milk and formula milk is not a recommended approach for managing protein allergies in breastfeeding mothers.

**Clinical Pearl / High-Yield Fact**
In breastfeeding mothers with allergies, the risk of transmitting the allergy to the infant is extremely low, making breastfeeding a safe and recommended option for most mothers with allergies.

**Correct Answer:**
✓ Correct Answer: A. Assure her that breastfeeding would not pass on the allergy to the infant