Formula Milk

Hi, Im a first timer daddy.. My wife is frustrated na kasi d masuck ni baby ng maayos ung dede ksi maliit lng nipple nya, bumili kame ng elec.pump, at 1st malakas pero knina feeling nya ang konti ng milk nya, at pkrmdm nya ngugutuman si bb. she wanted na mag mix feeding na, 9days old na po si baby ..ano po best formula milk na pwede? Thankyouuu