DNA methylation is a chemical change to our DNA that influences the extent to which our genes are expressed. DNA methylation has previously been used to accurately predict age, and the difference between a person's age and the age predicted by their DNA methylation has been shown to be associated with mortality and various health outcomes. Recently, this approach has also been used to identify a set of DNA methylation markers that predict gestational age at birth (epigenetic gestational age (EGA)). EGA has been shown to be associated with birth weight, independently of gestational age, sex and ancestry. In this project, we will look at whether EGA is associated with childhood growth trajectories.