i think instead of letting it go to waste you can definitely mix it with your toddler's formula. if you feel that your toddler is entirely weaned off and may not like it, you can start with very small amounts. see how your toddler takes it and whether she even realises the same. if it's not a problem, you can actually add more of the breastmilk to the formula.
make the formula milk the way you do and then add a bit of your milk to it.
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