Hindi ako expert sa formula, pero from what I've seen sa mga mommy friends ko, ang main difference usually ay nasa ingredients, ang Gold version typically has more probiotics and nutrients compared sa regular one, kaya mas mahal. Both are good naman, pero depende sa baby mo kung paano siya mag-respond; some babies thrive sa regular, some prefer ang Gold dahil mas gentle or less constipating. Best approach talaga is mag-start ka sa regular muna, at if makikita mo na may digestive issues or allergies, then you can ask your pedia kung worth it ba mag-switch sa Gold para sa baby mo. Which formula did your OB or pedia recommend? That's usually the safest bet to start with.