May I know how do you change formula from nan 1 to nan 2 ? I tried to change but lo don't like so I mix the two formula till now I giving him 4 scoop nan1 and 2 scoop nan 2 , how can I totally change to nan 2?

My friend replace one feed at a time instead of mixing. So initially she only changed 1 out of the 6 feeding sessions and gradually work towards changing all to stage 2. I think mixing would work too. Like what Yuna suggested, gradually tweak the ratio till you can change all to nan 2.