it sounds like its a 13-week old thing...my 13-week old rubs her forehead across my face (lower cheek/mouth area) when I hold her up (around breastfeeding time, either before during burp, or just after)...

she also rubs her head (from back to front...only with the right hand/arm), but I think that's a sleep thing (an "I'm sleepy" thing) and she only does this while breastfeeding on the left breast.

isn't it funny how they develop a "thing" so early?!