Fifty mothers of 6 month old babies and fifty mothers of 1 year old babies have taken part in a detailed dietary study. This meant keeping a 4-day weighed food diary listing everything the baby had had to eat and drink! This is enabling one of our nutritionists, Dr Lynne Marriott, to understand more fully the information on food and drink that we collect in the main questionnaire. It also provides more in-depth data about a smaller number of babies at each age. These data have been very helpful to us in understanding the quality of the data we have obtained on all children.