Use a food processor, blender or stick blender to blitz the banana and avocado until smooth
If you would like a thinner purée you can add a little extra liquid. See my suggestions above (breastmilk, milk, formula, water)
Mashed Avocado Baby Food
Mash the banana and avocado with a fork, to achieve a soft mashed texture
Notes
For me the quantities in this recipe make 2 small servings for a baby just starting solids, or one larger serving for an older baby. But serving sizes are very difficult to quantify in babies
Changes you can make to this basic baby food recipe to create other delicious and nutritious baby meals
Add some cucumber before you whizz... It disappears, your kids are none the wiser, but they have had vegetables for dessert!
Freeze the banana and rename it whizz ice cream
Replace both ingredients for ricotta and tinned pears
Replace the avocado with a generous tablespoon of Peanut butter