formula-can I go from 1 straight to 3?

[staky89]

Hi, My little girl is 7 and a half months old (born jus over 11weeks early) she was on nutriprem milk until a month and a half ago then consultant said we can swap her to normal milk. Shes on cow and gate stage 1 atm but is also having 3 food meals a day. Can I swap her milk from stage 1 to stage 3 or do I need to use stage 2 or is that just hungry baby? Im a little confused lol

Thanks for any help