In Chapter 2, we reviewed the intense passions that arise when parents discuss whether their children should cosleep or whether they need to sleep separately from their parents. The only other topic that I have found that sparks a similar level of passion among parents is the question of what to feed children and when to feed it to them. Again, the emphasis in this chapter is going to be on what the best available scienti®c evidence says, and not on what the authors of this book believe because it worked for us.