I don't see childhood pics of him with his corners and hairline exposed, but I can tell you it isn't usual for prepubescent children (besides babies who often have weird hair patterns until later) to have this forehead:
http://eworldcups.com/brad-pitt.html
(Scroll down to the second picture with his hair buzzed short)
Here is Clinton with his juvi hairline:
http://en.wikipedia.org/wiki/Bill_Clinton
(He has a slight widow's peak which shouldn't be confused with a mature hairline; note his corners and the transition between them and his temples)
Here are a couple women with their hairlines exposed:
http://hairstylesjoss.blogspot.com/2...hairstyle.html
Interesting to note: a minority of women have male hairlines. Many (along with many male children) also have "wispier" or finer hair in the corners where men typically lose it after puberty--those hairs sometimes look like they are miniaturizing from MPB, but they almost never fall out in females. (If they did fall out they might form a male hairline.) Here's an example of that:
http://cdn.blogs.sheknows.com/celebs...-hairstyle.jpg
(Notice the quality of hair in her corners compared to where it becomes very thick all over, but this is normal and not pattern hair loss. If you can imagine her hairline with those finer, sparser hairs missing, it would look more like Brad Pitt's)
Edit: Actually you can somewhat see this same phenomenon in the second photo on the hairstylesjoss website)
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