Anyone have any experience of this? Ds2 has slept in his amby natures nest from birth but has developed a very flat head at the back and looks all pointy from the side, almost conical! He is 4 months old now. He sleeps well in it so is obviously comfortable. Has anyone else had this? Any suggestions?? Am considering putting him in a cot instead, not sure if that would make it any better but am concerned about it getting worse....