Hi today whilst getting my 6 month old asleep she wouldn't settle and was crying while I was holding her to get her asleep, so as I've placed her on the couch she's jerked back and her head like sort of went back to but I'm just panicking and worrying if this will cause shaken baby syndrome she jerks a lot when she's upset or doesn't want to be held so when she does this I always just put her down but she jerked back quite abit and I just can't help but worry now, she's asleep now but would me placing her down onto the couch and she jerking back out of my hands cause this?