Protein damage in infants - indications and feeding mother's diet

Cow’s milk protein allergy (CMPA), colloquially referred to as "protein intolerance" in infants, constitutes the most prevalent form of food allergy in early childhood. It represents an aberrant immune response to dietary antigens present in dairy products, characterized by the production of allergen-specific antibodies (predominantly IgE-mediated), which subsequently trigger inflammatory cascades within the body. Clinical manifestations range from mild symptoms—such as urticaria, atopic dermatitis, gastrointestinal distress (e.g., diarrhea, colic), or rhinoconjunctivitis—to severe, potentially life-threatening anaphylactic reactions. The primary dietary triggers in pediatric populations include cow’s milk, hen’s eggs, and tree nuts, with milk proteins (specifically casein and whey fractions, including β-lactoglobulin, which is absent in human breast milk but may be transferred via maternal consumption of dairy) exhibiting particularly high allergenic potential. Epidemiological data indicate that CMPA affects approximately 6–8% of infants and children under three years of age, with a propensity for spontaneous resolution as immune system maturation progresses. Genetic predisposition (family history of atopy) and the physiological immaturity of the gastrointestinal tract and intestinal barrier in infants further amplify susceptibility to this condition. Additionally, due to cross-reactive epitopes, CMPA may coexist with hypersensitivity to sheep’s milk, goat’s milk, and other foods, including soy (observed in 47% of cases) and wheat (16%).

Cow’s milk protein allergy (CMPA) may first manifest during exclusive breastfeeding, though its symptoms become far more prevalent following the introduction of formula feeding. Research indicates that in 7–15% of infants, adverse reactions emerge immediately after the initial consumption of milk-based products, while 40–60% exhibit symptoms within the first week of artificial feeding, and 90% within three months. In Poland, this condition affects 2.7% of formula-fed infants and 1.8% of those who are breastfed. Although many children eventually develop tolerance with age, the clinical presentation of food allergy can be either localized or systemic, involving multiple organ systems: • **Gastrointestinal tract**: regurgitation, vomiting, colic, diarrhea, constipation, blood in stool or vomit • **Skin**: atopic eczema, urticaria, angioedema, pruritus • **Respiratory system**: allergic rhinitis, conjunctival allergic changes, hoarseness, laryngeal stridor, asthma • **Systemic reactions**: food refusal, failure to thrive, iron-deficiency anemia, irritability, sleep disturbances, or—in severe cases—anaphylactic shock. Given the non-specific nature of many symptoms, it is critical for parents to closely monitor their child’s behavior and physical responses, ideally by maintaining a detailed symptom diary. Such records provide invaluable insights for healthcare providers seeking to diagnose developmental abnormalities and implement appropriate interventions [2].

A diagnosis of cow’s milk protein allergy (CMPA) in an infant often necessitates **dietary modifications** for the breastfeeding mother. **Crucially**, exclusive breastfeeding up to **6 months of age**—compared to mixed or formula-only feeding—**reduces the risk of food allergy by 2- to 7-fold**. This is particularly significant for infants with a **genetic predisposition to allergies**, who should ideally receive **only breast milk for 4–6 months**, with solid food introduction **delayed until at least 5 months**. **Prophylactic elimination diets** (e.g., avoiding dairy preemptively) are **not recommended** for mothers concerned about allergies in their children. Instead, mothers should maintain a **nutritionally complete diet** while **monitoring the infant for adverse reactions**, as food allergens can pass into breast milk. If **alarming symptoms** (e.g., eczema, colic, diarrhea) arise, **immediate medical consultation** is essential. Upon confirmation of CMPA, the mother must **strictly exclude** cow’s milk and **all dairy derivatives** (including yogurt, kefir, cheese, and cream). After a specified period, the treating physician may order a **controlled food challenge**—administering a small amount of milk or dairy while observing the child’s response. **Notably**, CMPA is often **transient**; many children tolerate dairy after a successful challenge. **Regular testing is critical**, as mothers frequently continue elimination diets **unnecessarily** after the allergy resolves. However, **long-term dairy avoidance** increases the mother’s risk of **calcium deficiency and osteoporosis**, necessitating **alternative calcium sources**: parsley, chives, Swiss chard, kale, Savoy cabbage, oatmeal, wheat bran, and fatty fish. **Meticulous label reading** is also **paramount**, as allergens may be hidden in processed foods. CMPA ranks among the **most prevalent allergic disorders** in infants and young children. The **cornerstone of treatment** is a **maternal elimination diet**, removing all trigger foods. **Preventive dairy restriction is discouraged**, however, as prolonged avoidance may **compromise maternal bone health** and elevate osteoporosis risk in later life.