Peel sweet potatoes and cut into large chunks.
Place into steamer basket; cook over boiling water for 10 minutes.
Meanwhile, peel and core apples.
Place in steamer basket with sweet potatoes and cook for an additional 10 minutes.
Once potatoes and apples are tender, place potatoes, apples and pumpkin in food processor or blender and process until smooth.
Pour into ice cube trays and freeze mixture overnight.
Remove from ice-cube trays and place in large, resealable plastic bag. Use 1-2 cubes at a time for baby's fruit or vegetable serving.