Ay, I feel you mama! A few of us in our barkada experienced the same thing, sometimes babies just prefer formula talaga, even if we're doing our best with breastfeeding. Have you checked with your pedia kung may underlying reason like tongue tie or latch issues, kasi sometimes yan ang culprit at pwedeng ma-address? If baby's healthy, gaining weight, and happy sa formula, then that's okay na, the most important thing is na well-fed and contented ang baby, hindi kung saan nanggaling ang milk.