Hi, my 11 week old has always slept on his back (or on his belly but only only my chest - he has never been put to bed on anything but his back) but tonight when I put him down on his back he went straight onto his side. I moved him, he went straight back onto his side. This happened 3 or 4 times. I know I'm not going to sleep tonight for checking on him but is it okay to let him sleep on his side?? I know the guidelines say his back but I can't keep him there. I might stay up and put my hand on his belly all night to stop him rolling over, but I can't do that every night. Is this okay or does he have to be on his back? Thanks x