Previous studies of malnourished children in hospital have shown that their developmental quotients (DQS) improve as their nutritional status improves, but they have not taken into account the possible effects of being in hospital and of test practice. The present study assessed development of malnourished and adequately nourished children in hospital and found that mean DQS of each group rose to a similar extent during recovery from illness. It is concluded that DQS on admission to hospital were lowered by the children's discomfort and unhappiness at being in hospital, and/or by illness, and that rises in DQ shown by children recovering from malnutrition are not necessarily attributable to improving nutritional status.