Management of Cow's Milk Protein Allergy in Breastfed Infants
Understanding Cow's Milk Protein Allergy in Breastfed Infants
- Proteins from the maternal diet, including cow's milk proteins, can transfer through breast milk in sufficient quantities to cause allergic reactions in sensitive infants 3, 4
First-Line Management Approach
- When possible, breastfeeding should be continued in infants with CMPA, which is consistent with official recommendations for infant feeding 1, 2
- The mother should eliminate cow's milk and dairy products from her diet if the infant is symptomatic 2, 3
- This approach preserves the numerous benefits of breastfeeding while addressing the allergic condition 2, 5
Monitoring and Follow-up
- If the infant is thriving and remains asymptomatic after maternal dietary elimination, continued breastfeeding with the restricted maternal diet is appropriate 1, 2
- A nutritional consultation should be considered to assist the mother with the elimination diet to ensure adequate nutrition 2, 5
When to Consider Alternative Approaches
- If resolution of symptoms is not accomplished with maternal dietary elimination, or if the infant has failure to thrive, discontinuation of breastfeeding and introduction of a hypoallergenic formula should be considered 2
- Options for formula feeding include extensively hydrolyzed casein-based formula (first choice) 1, 2
- Amino acid-based formula (for infants who don't respond to extensively hydrolyzed formula) 1, 2
Important Clinical Considerations
- Maternal elimination diets should not be overly restrictive to avoid compromising the mother's nutrition and ability to breastfeed 3, 6
- If a maternal elimination diet is trialed, it is important to perform a rechallenge after 1-2 weeks to confirm the diagnosis before implementing longer periods of dietary restriction 3, 6
- Goat and sheep milk are not recommended alternatives due to high protein sequence homology with cow's milk 1, 2
- Regular soy formula is not recommended as a first-line alternative due to potential cross-reactivity (20-40% of infants with CMPA may also react to soy) 1, 2