is he very active in the day? like play too much thus "han bin"(have nightmares)?
or did he recently got a scare??
do you have a beanie pillow? put it on his chest (not to high) or you can try swaddling. it will make him feel safer if he is swaddled.
anyway, for pin since NB til now, she seldom wake up crying in the night.
as of what i rmb, perhaps less than 10 times?