Absenteeism, Allergies, Asthma, BCG vaccines, Birth weight, Blood tests, Body mass index, Breastfeeding, Breathing difficulty, Child anthropometry, Child health care, Congestion, Cooking fuels, Cough, DTP vaccines, Eczema, Education, FFQ, Fish, Fruits, Health care use, Health status, Hospitals, Household air pollution, Housing conditions, Housing materials, Intestinal nematode infections, Measles, Measles vaccines, Meat, Medicines, Multiple births, Parents, Physical activity, Rash, Respiratory function tests, Secondhand smoke, Siblings, Skin tests, Sleep, Sugar-sweetened beverages, Traditional medicine, Tuberculosis, Upper respiratory infections, Vegetables, Whooping cough