Quoting ~The Lunar Flower~:" I'm not super worried about it but DS is almost 12 weeks old & when he first lays down to sleeps he turns ... [snip!] ... his head itches. He was born with a lot of hair in the back(it was a good 2in long at birth & covered the back of his neck)"Normal. Mine did it for ages and got some really good bald spots on the back of their heads from it. I was so embarrassed of them because I thought it looks like I neglect my children and just let them lay on their backs all day long!! Thankfully hair is growing in now!