Is it okay to switch back and forth between two formula brands, Similac and Kirkland?

Is it okay to switch between formula brands?? WIC has been supplying us with all babies formula for the past several months, they give Similac Advance (the blue can). Starting this month we will be going through way more cans than they cover. I was wondering if I need to stick with Similac Advance or if it would be alright to supplement with the Kirkland Formula from Costco. It's much more affordable and we were on Kirkland formula before we got on WIC when baby was about 2 or 3 months old, he is 7 1/2 months old now. My baby has seemed to do well on both formulas, It would probably work out to being about half of each brand per month. This makes the most sense financially, but of course I want to do whatever is best for my baby!!
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If you plan on switching i would suggest staying woth the brand your switching too . I did this with my son and he got constipated . We wemt from similac to sams club to similac back to sams club and his tummy did not do well . We were testing out the sams club brand but we also had extra similac which is why we switched the second time .

Are you located in LA ? I usually sell the similac ones i get from WIC and use that money to buy the Sams club brand formula .

I wouldn’t keep switching, it could upset their stomach/ cause digestive issues

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