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symptoms of metal allergies - allergic reactions and skin rashes It might appear first blush that stomach acid would destroy the helpful antibody proteins given in breast milk and colostrum. On the other hand, unlike adults, babies produce much less stomach acid. So, a percentage of the prolactin and other helpful compounds survive the infant's digestive route. The progression is moreover helped by the fact that immuno-proteins are glycosylated, a kind of wrapper that helps protect them from being broken down in the child's stomach. Those allergens can furthermore become airborne. That means that proximity, not just contact, is enough to move the substance close enough to cause problems.