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We've never been intimidated by the blueberry-toddler combination. Weapon X loved frozen blueberries when he was teething (use small ones as large blueberries can be a choking hazard), so we just gave them to him before bath time.
Now X finds joy in pouring frozen blueberries (thawed) into his cereal. The freezing process makes berries soft and releases the juices, so what you end up with is purple milk! I also slice up frozen strawberries to put in his cereal.
Buying berries frozen is one way to get these antioxidant filled foods organic all year round without breaking the bank.