Child care practices and hygiene measures were studied at 6 months of age in a longitudinally followed cohort of 1476 infants born between September 1984 to March 1987 in four socio-economically different areas in and around Lahore, Pakistan. Although, 76-98% of the mothers looked after their infants during health and 96-98% during a diarrhoeal illness, child care practices and hygiene measures differed significantly between the four areas. During a diarrhoeal episode, the mothers from the upper middle class took timely medical help, fed ample food and Oral Rehydration Salts (ORS) to the sick infants and provided uncontaminated food to them in clean surroundings. The mothers from the village and the periurban slum took their sick child, mostly after the second day of illness, to a doctor, but preferred home remedies. Fourteen percent of the mothers in the village and 6% in the periurban slum did not seek any medical help at all. One-third of the families, from these two areas, fed food to children 12 hours after cooking; the surroundings of the child were dirty with large numbers of flies present throughout the year, though the food was commonly kept covered with a lid. We constructed a simple measure of the surroundings of the child, rated as dirty, medium or clean; it was found to be associated to both parental illiteracy and child growth, but not with housing standard. The main conclusion is that any attempt to improve child-care practices and the hygienic environment for the child, should focus on maternal literacy and simple health messages.