Captain reflux is pretty easy to spot so doesn't have to be something they just suffer with. Also it can have long term impacts if not treated ie colitis, oral aversion (making weaning difficult), delayed speech, attachment disorders in extreme cases. It really is incredibly painful if untreated yet once babies are medicated they're like different creatures. Omeprazole gave me a smiley baby back who I could leave kicking away happily on a play mat before that he had to be in my arms or else screamed inconsolably.
Symptoms are prolonged and difficult to sooth screaming, 'colic', sleep disturbances, back arching, reluctance to be laid flat, sour smelling breath, comfort feeding, fighting at the breast, prolonged hiccuping, weird throat noises / grunting after a feed, high pitched pain cries, vomiting or the sound of milk being regurgitated and swallowed back down, and occasionally hoarseness from stomach acid inflaming the larynx. Baby may only have a few of these.
If he has those symptoms push for ranitidine or omeprazole. It can take 2 years to outgrow reflux you can't live with a miserable baby for that long 