The prevalence of childhood overweight and obesity is increasing around the world. Childhood obesity has been shown to be related to adult obesity and other health related problems. Studies have reported that a high intake of protein in early life is related to rapid early growth which may be a risk factor for obesity in later childhood. In ALSPAC dietary information has been collected repeatedly from a 10% sub-sample of the ALSPAC cohort (around 1000 children) at the following ages: 8 months, 1 1/2 years, 3 1/2 years, 5, 7 & 10 years. All the dietary data have been coded and prepared and are ready for use. Children will be allocated to quintiles according to their protein intake at 8 months of age in the first instant. Foods will be investigated to ascertain the sources of the protein in the diet at 8 months and the degree of tracking of protein intakes will be assessed at 1.5, 3.5, 5.0, 7.5 & 10 years. The tracking of protein intakes from one age to the next will be assessed using a multinomial logistic regression to estimate the odds ratio for being in the highest quintile for protein at the each sequential