Energy intake, maximum smoked, infections, antibiotics and paracetamol use during pregnancy; maternal education level, housing tenure, financial difficulties, prepregnancy BMI, ethnicity, age, parity, history of asthma, eczema, rhinoconjunctivitis, migraine; child’s sex, gestational age, breast fed in first 6 months, day care at 8 months, multiple pregnancy, pets in infancy, damp/condensation/mold, child exposed to environmental tobacco smoke, season of birth, season of FFQ completion, birth weight, head circumference, birth length