Aww 3 weeks pa lang, ganyan talaga ang adjustment period! Okay lang na mag-supplement ka, a few of us tried different formulas kasi na-overwhelm din sa breastfeeding, and honestly maraming options na available like S-26, Lactum, or Promil depending sa budget mo at ano gusto ni baby. Since siya nagstuggle mag-latch at may supply concerns ka, I'd really suggest checking with your OB or pedia para malaman kung okay lang talaga ang combination feeding at kung may adjustment needed sa latch, kasi sometimes mas mabilis ang improvement once na ma-address ang root cause, plus they can rec the best formula para sa kanya specifically. Kaya mo yan mama, first few weeks ang toughest pero it gets easier!