People born in autumn or winter are more likely to suffer from allergies than people born in spring or summer. Nobody is certain why this is, but there are several theories. These include seasonal variations in sunlight (which could affect vitamin D levels), levels of allergens such as pollen and house dust mite (which vary by season), the timing of the baby’s first chest infection (colds tend to be more common in winter), and maternal diet (price and availability of fruit and vegetables vary by season).
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