Prep the apple. Peel, core, and chop the apple into small pieces. If your toddler has a very sensitive tummy, steam the apple for 3–4 minutes to soften it, then cool slightly.
Add to blender. Place the apple, banana, milk, yogurt, and any optional add-ins into the blender.
Start with less liquid if you want it thicker.
Blend until very smooth. Run the blender for 30–45 seconds, scraping down the sides if needed. You’re aiming for a silky, drinkable texture with no chunks.
Adjust consistency. If it’s too thick, add a splash of milk. If it’s too thin, add a few oats or a bit more banana and blend again.
Serve right away. Pour into a small cup or a spill-proof straw cup.
For very young toddlers, a spoon works well too.