Generally in Canada, the recommendation is that if you wean before 1 year, then use formula. If it's after a year, you can go directly to cow's milk - you're really not supposed to start cow's milk prior to one year old. The baby needs the iron supplement in the formula, particularly, but more and more studies are showing problems when kids are exposed to the proteins in cow's milk at a young age...better to wait, I think. Your GP might not be up to date :oops: or might just be trying to save you a few dollars, IMHO...
HTH