Do it gradually 1 bottle per day and increase it over a week or so until he’s fully on the new formula, I’d probably start now so you have time to see how he gets on
You could start your switch now. Find formulas that are where you are and there and just start switching. Are you able to order and get kendamil shipped to you? In Italy
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Yeah you should be able to. Switching formula isn’t the worst thing, hopefully your little one doesn’t mind it. When you do try, buy the ready made milk from Aptamil and see how he takes it. If he doesn’t like it, at least you haven’t spent a fortune on the big formula tub!