How long would you shake your baby (< 10months) in the sarong/ yao-lan, to encourage her to sleep?

Personally, I don't feel good giving my baby "Yao Lan" to sleep in. Yao lan, or sarong cradle, will cause injury to your baby by falling out of it if it breaks or not securely properly. Baby will suffocate if he sumps in it and is unable to turn especially for the babies who are 4 months or younger. He might get bleeding in the brain from bouncing though light bouncing will not cause the adverse effect. It also will be difficult to wean the baby off. Once baby is used to it, it may be difficult for you to settle a baby to sleep when you are outside.