Ninety-one families containing 140 children under 4 years of age at enrolment were studied. At 1-monthly intervals, the children were weighed and measured and qualitative information about feeding habits was obtained. Weighed dietary surveys for periods of 5 d were made at approximately 8 months, 3 years, and 5 years of age; there were forty-six failures in 260 surveys attempted. 2. At the four specified ages, mean energy intakes were 3-75, 5-03, 5-82 and 6-75 MJ (896, 1203, 1392 and 1613 kcal)/d respectively. At 8 months, milk products provided on average, 43% of the total energy intake, and commerical baby foods provided 17%. These values decreased to 21 and 2% respectively at 20 months and there was little further change therafter. 3. Average intake of energy and of most nutrients met recommended intakes (Department of Health and Social Security, 1969). Iron intakes were marginal, and vitamin D intakes were low. 4. The energy intake of boys was significantly higher than that of the girls at 3 years of age, but the boys were not significantly heavier. The energy intake of children from "manual-worker" families was higher than that from "non-manual" families. Similarly, the energy intake of children from larger families was higher than that of children from smaller families. 5. Energy intakes were correlated with body-weights and with rates of gain in weight. Irrespective of body-weight, "big eaters" at 20 months tended to be "big eaters" at 3 years also.
