Buying baby food is as simple as picking the cans and containers off the grocery store shelf, but making it at home can be just as quick and easy. If the puree is too thick, you can thin it with breast milk, formula, or boiled water.
Simmer apples, covered, in a large saucepan with 1/3 cup water until tender, about 10 minutes. Transfer mixture to a blender. Working in small batches, blend until smooth. Pass through a fine sieve. For a coarser texture, pass apples through a food mill, or pulse in a food processor. Fill 1/4-cup plastic containers or ice-cube trays with applesauce.