I can find no requirement on mixtures. This is all that I found:

Prepared infant formula shall be labeled with the individual child's name and kept in the refrigerator when not in use.

22 VAC 40-110-1010. Formula preparation.
If infant formula is heated in a microwave oven, precautions shall be taken to prevent scalding. Only refrigerated formula shall be heated. When formula is heated in the bottles, the bottles shall be upright and uncovered. Heating time shall be no more than 30 seconds for four ounce bottles and no more than 45 seconds for eight ounce bottles. After heating and replacing nipples, bottles

VIRGINIA DEPARTMENT OF SOCIAL SERVICES Page 22 of 32 MINIMUM STANDARDS FOR LICENSED FAMILY DAY HOMES 22VAC 40-110-10 et seq. 11/93
shall be turned up and down 10 times and the temperature tested by dropping milk on the top of the hand. The temperature of the milk shall be cool on the hand.

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