Ay, ramai yang bagi Similac Intelli-Pro Step 1, mostly okay la! A few of my mum friends tried it, their babies tolerate it well, tapi memang some kids okay dengan formula ni, ada yang perut jadi sensitive. Best you observe your baby's poop consistency, any rashes, or tummy issues within the first week or two, kalau okay, boleh terus je. Since setiap baby berbeza, the try-and-error part yang you mentioned memang necessary, so jangan worry sangat dulu!