Aww mama, ganyan talaga sometimes, babies go through phases! At 2 months, possible na teething discomfort, thrush (white coating sa mouth?), or even just a preference shift, especially if formula is filling him up faster kaya less interested sa breast. A few of us tried going back to exclusive pumping + bottle feeding para ma-maintain ang milk supply, and iba-iba lang talaga ang adjustment per baby. Since he was latching okay naman before, I'd really suggest checking with your pedia or a lactation consultant kasi they can check if may thrush or positioning issue, hindi ito normal and they can give you specific solutions based on what's going on. Huwag mawalan ng pag-asa, marami pang options!