Formula milk and vitamins

Hello po. ☹️ Any recommendations FORMULA MILK and VITAMINS po for my 2mons Baby Girl. Birth weight nya po 2.3kgs lng po tlaga sya and then after 3 days discharge from hospital she got admitted bcos dehydrated kasi di pa po lumabas gatas ko naging timbang nya po 2.0kg (4days old). So nag mix feeding po ako I gave her S26 gold until 1 month and half old her weight is 4.0kgs. But pinalitan po namin last week lng po ng Bonna kasi maganda daw yun sabi ng mama ko though cheaper sya compared to S26 gold. Vitamins nman ng baby ko is Tiki tiki and nutrillib. Sabi nila kasi maliit tlaga si baby ko ? but tinignan ko naman yung chart pasok naman po sya sa rate ng kanyang edad at timbang Any recommendations po? Kung anong magandang formula milk and vitamins. Or should I change it or not?