Ay ganyan talaga ang normal sa newborns, momshie! Initial weight loss ng 1-2 weeks is very common kahit exclusive breastfeeding, parang nag-adjust lang ang katawan nila, tapos bumalik na agad, kaya okay lang yan na bumaba to 2800g then umakyat na to 3100g by 6 weeks, parang normal newborn growth pattern. Masigla and malakas ang lo mo kaya I think good lang talaga, pero if you want peace of mind just mention it sa next pedia visit, sometimes babies take a few weeks to find their rhythm sa breastfeeding, especially if they're still learning to latch properly or if your supply was still stabilizing.