Lil Mixins ($35) offers three varieties of mix-in powders that can be added to pureed baby food or sprinkled onto food if you're practicing baby-lead weaning. Families can choose between three powders — baked egg, peanut, and tree nut — to help expose baby to the protein early and often to potentially reduce the risk of developing an allergy. Each jar provides a four-month supply, and each serving makes sure a baby gets the studied 2 grams of protein of each food.