When does your baby outgrow?

Any mummies here who's LO relies heavily on yaolan to sleep or nap? My LO is 14 month soon and he has been relying on yaolan to sleep since he was 6 months old because my in laws have been fussing us to put him into yaolan because he's getting heavier. At what age did your LO learn or manage to sleep without yaolan? And did you do anything eg. rocking? My LO refuses to be rocked in the arma anymore.