Prep your fruit. If using fresh strawberries, hull them. For a thicker smoothie, use frozen strawberries and a frozen banana.
For a thinner smoothie, use fresh banana.
Add liquids first. Pour 1/2 cup milk and 1–2 tablespoons orange juice into the blender. This helps the blades catch.
Add creamy base. Spoon in 1/2 cup plain whole-milk yogurt. If using avocado, add 1–2 tablespoons now.
Add fruit. Add 1 cup frozen strawberries and 1/2 to 1 banana (to taste).
More banana equals more sweetness and creaminess.
Boost nutrition (optional). Sprinkle in 1 teaspoon ground flaxseed or chia seeds. Add a tiny splash (1/8 teaspoon) vanilla extract if desired.
Blend until silky. Start on low, then increase to high for 30–45 seconds until smooth. If it’s too thick, add a bit more milk.
If too thin, add a few more frozen strawberries.
Taste and adjust. For more sweetness, add a couple more strawberry slices or a bit more banana. Avoid honey for children under 1 year old.
Serve safely. Pour into a small cup or sippy cup. For toddlers new to smoothies, serve slightly thinner and offer with a straw to slow the sip.