Watch: McIlroy signs baby at PGA Championship practice round

Rory McIlroy has fans of all ages.

During preparations for this weekend's PGA Championship at Quail Hollow, the world No. 4 was asked to sign a baby - and he politely obliged.

While the child certainly has no idea why a stranger took a sharpie to his back, you can bet the family will hold on to the piece of clothing as it just became substantially more valuable.