Baby sleep

Lo is 7 months, exclusively BF and co sleeps most nights, will sleep in his bassinet for a few hrs a night but was waking up really often just for comfort “feeds”. Today we moved him to his crib. We did his sleep routine fed and laid him in his crib. He slept for one sleep cycle(40ish mins) woke up and cried 15-20 mins and fell back to sleep. My question is, if he wakes up again should I go to him? Feed him then put him back, or just let him go the whole night? I feel like he didn’t cry to much in the beginning so getting him even just to feed will set us back? Any info? My other babies slept 12 hr nights but idk if he’s still too young to try?