Ok, it might not be reflux but as Viktoria says it might be something else, particularly as he's doing it at night as well as during the day. Many babies have short naps during the day for reasons to do with A times, or development, but waking all day and all night is a strong signal to me that something physical might be wrong. I don't want to worry her, but perhaps she (and you) could think about it a bit. Sounds like he goes to sleep really well, though, that's great.
Three other things to say.
(1) Short naps can mean different things. 30 mins is generally OT, 40 mins generally UT. So it would be good if your friend could note down how long each nap is, and how LO is when he wakes (happy, crying, etc). It might make things clearer. And maybe then you can post an EASY for us to see? It would be really good to see what their day looks like.
(2) If he goes back to sleep with a bit of patting-shushing, that's great. It does take a while, maybe several weeks, for LOs to learn to get through the transition. How long has she been doing it? How long does it take for him to get back to sleep, and how long does he sleep for then?
(3) If he will sleep in a sling/carrier/buggy/wherever, she might want to do this for one nap every day or two: Put him down for a nap in his cot/crib, and when he wakes up, put him in the sling and go out. Hopefully he will go back to sleep for another 40 mins or so. He will catch up on sleep and she will get a bit of a break from standing beside his cot.
Perhaps this sample routines might help her:
chronological EASY samples, 4-6 months Yes, for me as i have read the book, i really understand about not recommend cio. But in vn, we really lack of info & i dont why cio becomes trend now (or its the only method they know). Im trying to introduce pupd, shush-pat & Pantley to friends.
Bless you, it's not easy but so great that you're trying to help your friends and their LOs