If lo is 15 months can she still take stage 2 milk ? Is there a need to follow stage 1 2 3 or 4 ?

Actually for me I feel no big difference between stage 2 or 3. Apart from the pricing! Taste felt the same and baby didn't even notice when I changed to stage 3. Poop as per normal too. She drinks Friso. Also I check with PD, and she said ok. Anyway, at this stage, they don't really need formula already

You can always transit late but never transit early. Other than the percentage of ingredients differents, it is made in this way to match the amount of vitamins your baby needs at that stage.

No big difference! I give them whatever i have before moving to the next stage. If i have free tins of stage 2, i will still offer to my LO

Don't transit early. No harm in waiting and transiting at a later point. Its usually due to the amount of vitamins that's required.

Not much difference except for the prices. That's a killer!

Can take but stage 2 is more "fattening"

Yes