A soft food diet is made up of foods that are easy to digest. They’re usually soft in texture and low in fiber. The idea is to eat foods that are easy to swallow and that you don’t need to chew much.

When Dariya Quenneville’s infant daughter was ready for solid food, she skipped the mushed up avocado and banana. On the menu instead? Raw egg yolk and puréed chicken liver. The child, named ...