Hi! This may be a dumb question (I know, I know, there's no such thing as a dumb question...) but just wondering if it's ok to switch up formulas when I'm only supplementing a bit with it. Right now DS is 5 months old and gets about 3oz of formula mixed with 3 oz of ebm for the df. I am slowly adding 1 oz of formula at a time until that feed is exclusively formula but he'll remain bf beyond that. With DS1 I did the same but only used Nestle. With #2, I've received a few cans of Enfamil free and have been using Nestle to start so I wouldn't mind using the Enfamil when the Nestle is done.... I will use Nestle again when that's gone, though.....thoughts?