I think it's an allergy thing
Yep. Strawberries are the same for the first couple yrs.
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In both cases i believe its actually a risk of botulism exposure. Botulism spores are destroyed by stomach acid in adults but an infant (<1 year) has less/weaker stomach acid than an adult, the spores can survive the belly dunk and end up nastying up the lower GI, with unpleasant results.
Also something to think about if you have frequent heart burn issues and take alot of antacid or pump inhibitors for it.