he may not have 'traditional' reflux in the sense of being sicky.....it may be 'silent reflux', which makes them feel as tho they have constant heartburn. this is was DD3 suffered with (well.....she was sicky and heartburny).
I have had four with reflux....three with dairy allergy
DD2 (allergic to dairy)was sicky all the time, fed all the time (the HV never believed me when I said how often until I kep a diary.......18 feeds per day, and that was BF, so you can imagine how tied I felt, and how dented the sette looked).
DD3 (allergic to dairy) threw up constantly, and was so drained from that she fed very badly. also screamed all the time......so much so that at 3mths I lost it and gave her 10mils of calpol as I just could not take the screaming anymore....she was 9lb at that point (was 8lb born, so took three mths to put on a lb she was that sicky). I then rang and confessed to the docs, so they finally took me seriously.......she had the worst reflux they had ever seen in a NT child!
DS1.....sicky and screamy, but not like DD2 or DD3. and he was not allergic to milk either.
DS2.......hell! that is all I can say. he was a dream baby in one respect (I could have have ten of him) and was very easy to settle with a dummy and a fleece blanket, as long as I was within his sight at all times, but he was very allergic and very hard to feed as his reflux was not so obvious, and it took until he went yellow at 2mths for them to figure he was allergic to milk like his sisters had been.
that is an essay, sorry, but what I am trying to say (and probably not well) is that none of them had exactly the same symptoms, and yet all of them suffered some degree of reflux/heartburn/milk issue.
oh, DD2 and DS1 never ever lost weight with their reflux...in fact, they gained beautifully. DD3 and DS2 dropped from the 75/50 centil at birth to off the charts completely......and until they were two I was constantly asked if they had been premmie babys.
soooo
do not rule it out. he might just be teething badly and generally unsettled, but he may have some degree of reflux/milk issue.
lots and lots of hugs tho, and hugs for the mini-monster