Hi everyone a couple of times when Charlie is drifting off to sleep I've noticed his body quivers like he's cold. Hes doing it now as he breathes in. He can't be cold as he is curled up with me. What could this be?

Also I am so paranoid that I sometimes listen to his heartbeat when he's sleeping. It sounds irregular like a "glub glub glubglub.....glub glub...."

I was very worried but then aren't murmurs more of a "glub glub woosh glub glub woosh" ?