R.M.
I guess my recommendation is a mix of several below. I don't think that changing brands every can is a good idea, but if you baby doesn't have problems, you can change from time to time.. and I did. I also had a coupon for one brand and used it to buy those single serving for on the road emergencies. It never seemed to be a problem. If cost is an issue, I agree with all the posts that say go generic. I did that at 6 months and wish I had done so earlier...you still save money over the name brands and the nutrients are essentially the same.