From the whole ALSPAC cohort, a 10% “Children in Focus” subcohort (1,335 full-term singleton infants) was randomly selected from the last 6 months of recruitment for more detailed and regular measurements of infant and childhood growth on up to ten occasions until 5 y (at 4, 8, 12, 18, 25, 31, 37, 43, 49, and 61 mo), and the whole cohort were invited for measurements at 7 and 9 y [16,17]. Complete data for this analysis were selected from measurements at birth and 2, 5, 7, and 9 y. Weight (measured on Seca 724 or 835 scales) and standing height (using Leicester height measures, http://www.childgrowthfoundation.org/) were measured at follow-up visits to the research clinic. Breast-feeding was recorded as current status at age 4 mo (including up to one formula feed per day), and age at introduction of solids was recorded by questionnaire.
