Arrange beans on a steamer rack in a large pan over 1 inch water. Cover and bring to a boil.Reduceheat.Steam until tender, about 8 minutes. Plunge beans into cold water to stop the cooking.
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Pulse in a food processor, or pass through a food mill fitted with the medium disk. Add formula, breast milk, or boiled and cooled water as needed. Fill 1/4-cup plastic containers or ice-cube trays with puree. Use same method for green peas.
Comments: Remember to start with silky, smooth purees. You can work up to thicker textures as the baby gets older. If the puree is too thick, you can loosen it with breast milk, formula, or boiled water.