In a medium saucepan, bring 2 inches of water to a boil. In a steamer basket, add in the butternut squash, cover, and steam for 4 minutes.
Add the apples on top of the butternut squash, cover, and steam for an additional 2 minutes.
Add the corn on top, cover and steam for an additional 2 minutes. Let cool slightly. Reserve the steamer water.
Place all of the ingredients into the blender and puree for 1-2 minutes on high or until the puree is completely smooth. If puree is too thick, add in reserved steamer water, breast milk, formula or stock, a tablespoon at a time until you reach your desired consistency.
Serve and enjoy!