Cribsheet: A Data-Driven Guide to Better, More Relaxed Parenting, from Birth to Preschool (The ParentData Book 2)

by Emily Oster

The delay between food introductions is to see if any food causes an allergy. If you feed your kid strawberries and eggs and tomatoes and wheat all in a single day and they have an allergic reaction, it will be hard to know what the source is.