Hi Girls Daniel is almost 11 months old and st...

Hi Girls Daniel is almost 11 months old and still on 5 bottles on 260mls of formula day and 3 solids meals a day plus afternoon snack. i would like to change one of his bottles to cow milk as formula is getting really expensive, he goes through 3 tins a fornight. how would i go about doing this??? and which bottle should i start with. thanks Leenie