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 pears, covered, in a large saucepan with 1/3 cup water until tender, 5 to 10 minutes. Drain; reserve cooking liquid. Transfer pears to a blender. Working in small batches, blend until smooth. Add reserved liquid if needed. Pass through a fine sieve for a smooth texture. For a coarser texture, mash with a fork. Fill 1/4-cup plastic containers or ice-cube trays with puree.