Certainly, they can. The authors of most of the books even encourage making the recipes in bulk batches that can be used right away with some of the portions stored in the freezer for future use. Being able to store some prepared foods is a vital part of being able to make homemade foods all the time for babies. The very last book listing shows you how to prepare three months of foods in advance for the busiest of parents. These only take three hours to prepare too.