The NHS advice is clear on what to give in terms of "stage" marketing shit.
You give stage 1 (newborn) formula up to a year, then full fat cows milk (exception is any baby specific medical advice of course, such as if you're on goat milk or one of the special diet Powdered ones you can only get on prescription).
There is no medical need for normal babies To go onto stage 2 (invented so companies could market formula). Most babies don't need the hungry baby shite (it just clogs them up as harder to digest, resulting in babies who end up consuming less milk.. perpetual cycle of unhappy baby)..
Seriously, there is NO confusion or ambiguity here. Do what the fucking NHS says to!
No ifs. No buts. Just listen to the unbiased clinical NHS advice (layering any baby specific medical advice alongside that ofc).
Any other course of action is mental.
You should not even be trusting randoms like us on the internet on this. Our information might be inaccurately understood or written, out of date or maliciously intended!
Get thee to the proper impartial medical advice, basically.
And ffs don't call the aptamil call centre 