It happened to me after my daughter. It was mostly in the front, and it grew back after MONTHS, it just took a long time (my hair grows slowly anyway) and I had to endure the sticking up (shorter) hairs all over the place for a while. It was unbelievable the amounts of hair I'd have in my brush / shower! And to touch my already fine hair, especially just around my face / hairline; it was kind of disheartening and frustrating, but its just hair and it grows back. Its a shock, I know! Especially since it didn't happen with your first child, but its not a "boy thing", I'm certain! Anyway, scarves and head wraps are cute and very much in style, lucky for you, if you like them! A lot of us go through it, and at least its not as permanent as stretch marks or melasma or any other number of lovely things that come along with pregnancy. I have heard it is due to the drastic change in hormones. I have heard it is just normal hair shedding that has returned after not shedding while pregnant. Either way, it comes back. Hope this helps!