Formula Return?

CJ

Anyone know if you can take unopened cans of formula back to Walmart to exchange for a different kind? My son is on the Enfamil Enfacare for extra calories and I got the Similac Neurosure thinking it would basically be the same thing. Technically it is, but his nutritionist wants him specifically on the Enfacare. I don’t have my receipt for it but I just wanted to swap the Similac for the enfamil. Anyone know if they allow that?