hello, my baby sleeps in a cot or mattress because discourage building a habit that baby has to be rocked to sleep. But baby does sleep in yaolan at times when going to in law's place.
My confinement lady also discourages yao lan BUT she has a TIP for those who wants to use yaolan..stop the rocking once baby is sleeping and verge of falling asleep and let baby fall asleep. Prevent the habit of being rocked and need to be rocked to return to sleep.