I'm assuming the question has to do with Feta being a "soft cheese" and is recommended to be avoided while pregnant or with babies:
"Some aged and soft cheeses — such as feta, brie, blue-veined cheeses, and Mexican-style cheeses like "queso blanco" or "queso fresco" — are off-limits to babies, says Tanner. Those cheeses are at a higher risk of being contaminated with listeria monocytogenes, a form of bacteria that can cause fatal food-borne illness, especially in infants, pregnant women, and the elderly. While the risk is slight, avoiding aged or soft cheeses — especially unpasteurized varieties— is the best way to avoid this danger."
I think that the recommendation to avoid these is less when over 1yr.
I got this from http://www.babycenter.com/408_when-c...ese_1368504.bc
(first place I could find it).