Tukar susu Formula

Hi everyone, I nak mintak pendapat.. Macam mana ya nak tukarkan susu fm? Sebelum ni my son minum lactogen step 1, ni nak start solid ni ingat nak tukar susu dupro, ada suggestion or tips tak? Thanks lots momyzzz!🫂🫂💜 p/s nah i selit gambar budak debot ni sekali hehehe