Canadian Healthy Infant Longitudinal Development (CHILD) study examines how a child's environment during pregnancy, and in the first few years of life, can interact with genetics to affect the risk of developing allergies, asthma, type 2 diabetes and other chronic diseases

If just 24 children can help scientists discover that Caesarean sections and formula feeding may deprive babies of the protective gut bacteria needed for lifelong health, just imagine what will be discovered by collecting a wide range of health information from some 3,500 children. Scientists believe it will influence everything from health policy and building codes to parenting decisions for decades to come.

Those 3,500 children, along with their mothers and about 2,600 fathers from Vancouver, Edmonton, Toronto and several communities in Manitoba, are on the front-lines of the Canadian Healthy Infant Longitudinal Development (CHILD) Study, a national birth cohort study funded in part by the Allergy, Genes and Environment Network (AllerGen).