Oh mama, hang in there, 4 days is really still very early, and from what I've heard, most reflux babies take at least 2 to 4 weeks on medication before you see a meaningful improvement in milk intake, so try not to panic just yet. My friend's baby was on a similar journey and her PD actually advised her to ask specifically how long to give the medication a fair trial before deciding if it's working, because some meds need time to build up, and that framing really helped her feel less anxious about the slow progress. Some mums also found that splitting feeds into smaller amounts with a 30 to 45 minute break in between helped their babies take more overall, like 60ml, rest, then another 60ml, rather than pushing for a bigger single feed that causes more discomfort. There's also a thickening option (something like a formula thickener) that some parents have had good results with, though a few felt it didn't make a difference for their LO, so it really varies. It's worth having a detailed chat with your PD or a paediatric gastroenterologist to get a clear timeline and reassess if needed, especially with the percentile dip, better to loop in the specialist sooner rather than later.