 Children will be randomly placed in one of the two study groups. There will be an equal number of children in each group. All groups will go through the exact same procedures during the study; the only difference between groups will be the amount of vitamin D in the milk products they will consume each day. Families will not know which group their child is in until the study is complete. Children will continue to drink their regular milk at home and the investigators will provide flavoured yogurts and cheese to eat every day for the entire 6 month study. Families will be given a fresh supply of the yogurt or cheese products every 4 weeks along with instructions. 