 Demographic, Dietary and Activity Surveys - At screeningbaseline, parents will be asked to complete a demographic survey regarding their anthropometry, ethnicity and race, income and education using the same descriptors as defined by Statistics Canada. Infant dietary intake over the study period will be assessed using 3-day diet records completed by parents after each visit. While infants are breastfed, milk intake will be assessed by test-weighing of the infant before and after breast feeding for a 24-hour period using a portable electronic scale Tanita Corporation Inc., US. This will provide nutrient intakes to help explain growth. Dietary intake from other foods is documented using household measurement items and recorded on the 3-day record. All nutrient analysis will be completed using the Nutritionist Pro software version 4.7.0 Axxya Systems LLC, Stafford, TX and the most recent Canadian Nutrient File database Health Canada. At 2 and 3 y of age, the Habitual Activity Estimation Scale Questionnaire HAES will be completed by parents for a weekday Tuesday, Wednesday, or Thursday and weekend day Saturday over the past 2 weeks. Parents divide their childs day into 4 segments wake-up to breakfast, breakfast to lunch, lunch to dinner, dinner to bedtime. For each time interval, the time spent in each activity level is used to estimate overall level of physical activity. The 4 activity levels as established by the HAES questionnaire are: inactive lying down, sleeping, resting, somewhat inactive sitting, watching television, activities done mostly sitting down, somewhat active walking, playing with toys, and very active activities that make a child breathe hard and sweat, like running and skipping. 