http://www.kidshealth.org/parent/pregnancy_newborn/common/positional_pla...

This is a great article on PP. Most babies have the condition b/c place them to sleep on their back now. As you will read in the article, as long as there is ne neck problems associated with this , than don't worry too much.

When I got my son a jumper , an activity station , and a bumpo so he could sit up and play wi toys his hair started to come back in and his flat spot is rounding out .
Those are my suggestions. If he is not sleeping , he is sitting