Infants showing slow growth in infancy compared to their peers have been identified in ALSPAC and their growth followed up to 13 years of age. This work has shown that if they grew slowly between birth and 8 weeks they then grew very fast between 8 weeks and 2 years with their growth in weight outstripping their growth in height. By 13 years they were very close in weight and height to their normal growing peers. A second group who grew slowly between 8 weeks and 9 months were very slow in catching up with their normal peers and remained much lighter and shorter at 13 years.ALSPAC has collected data on feeding behaviours, difficulties and foods and drinks consumed by these children at 4 weeks, 6 months, 15 months, 2 years and so on. These include breast and formula feeding as well as age of introduction of solid foods and other drinks. There are also questions about parental feeding practices including feeding on demand or by schedule, use of food as rewards and attitudes to feeding. On a 10% subsample of the children there are detailed diet diaries at 4, 8 and 18 months these give a great deal more information about types of foods fed and timing of meals and drinks. Two investigations will be carried out one into the early slow growing group and the other into the late slow growing group using the rest of the cohort as a comparison group. The reason for the division is that we have previously shown very different recovery growth patterns in these two groups and it important to determine if nutritional or behaviour differences are determining these differences in growth trajectory.