Add all ingredients, including any add-ins, to a blender.
Blend until very smooth, stopping to scrape down the sides of the bowl as needed.
Serve or store in an airtight container or a reusable Squeasy Gear pouch, with the lid snapped, for up to 24 hours in the fridge.
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Notes
Store any leftovers or make ahead and keep in the fridge for up to 24 hours in an airtight container. Freeze smaller amounts in an ice cube tray and defrost 2-3 at a time for a toddler serving.
Use full-fat yogurt since little ones need plenty of fat for brain development.
Add any optional ingredients for additional nutrients.
Use fresh mango and add a few ice cubes to the blender to have the classic smoothie texture. (You can also leave it out for a drinkable yogurt-like consistency.)
Try 1/2 cup orange juice instead of fresh orange.
Add a handful of baby spinach for a green mango smoothie.