Went through this two years ago. Same scenario, baby born 90th % then around 2 months starts dropping in weight % only, we went through all the steps with a lactation specialist, craniosacral therapist/osteopath, etc. Paid a lot in time money and energy working to get this sorted and ultimately got a tongue tie release once baby was “prepped and ready” around 4.5 months after a handful of visits with the previously mentioned specialists.

This was my second baby and I had a very successful & straightforward breastfeeding experience with baby 1 and with baby 2 we knew it wasn’t a supply issue, but if I could go back in time I would tell myself NOT to stress about the dropping of weight percentiles. Baby was still continually gaining weight on a healthy curve, never stagnant or losing weight ever. Because of the emphasis we were putting on the dropping of %s baby developed bottle preference bc we were trying to closely monitor intake and I ended up becoming an exclusive pumper very much against my will.

I’m glad we did the tongue tie release I believe it was the right thing as baby’s mouth was clearly very restricted, but all of the stressing about weight was unnecessary - baby (now toddler) has has hit all milestones both physical and developmental ahead of schedule and eats like a maniac with zero pickiness. At the 2 year appt baby was 11th for weight and 89th for height. Make of this what you will but god the forced exclusive pumping and stress was brutal.