Some are still hard to sex at four months. Some are not, for example fluxcore's pic at 4 months of his male. I could be wrong, and don't mind admitting it. I'm about 90% leaning female.

Also if you didn't notice, not many others are chiming in, it's still difficult to make a 100% definite answer on this one.

Like Carlos asked for, a picture of a "profile view" would probably help.