11 month old is slowly staring to not drink much off her formula (1st child loved hers so didn't have much issue) she only has 2 bottles 1 at night and 1 in the morning. But only taking 1/2 oz off these is it too early to give cows milk I don't want her not to drink milk atall as my first loves her milk even at 2 and a half? I know it's normally after 1 but does a few weeks really make a difference with this?