Wow, Jess, I can't believe that Dylan is 6 months old already!
Time flies by so quickly...
I don't have any direct knowledge about freezing formula, but found this information on the baby food website that I use:
"Formula companies warn that you do not freeze Infant Formula due to a separation of the formula and not due to any health or nutritional risks. Keep in mind that the amount of formula used in purées is not equal to feeding an infant a bottle of formula.
"Freezing of any Enfamil formula is NOT recommended. Freezing infant formula can lead to physical property changes like fat separation, which may prove difficult for sensitive infants to digest. Freezing will not extend the expiration date of the formula." "Freezing of our products may cause loss of desirable appearance and functionality (though not nutrition), and is not recommended." Clinical Frequently Asked Questions, Storing Enfamil
You may wish to mash or puree your baby foods and freeze without thinning with any liquid. Should you decide to do this, you simply thaw the "un-thinned" food cubes and then thin the food cubes to the desired texture that your infant requires."
(
http://www.wholesomebabyfood.com/veggiefruit.htm)
HTH
Vikki