It's really a controversial topic and lots and lots of hoax talks about it.
Put it in this way, how would you evaluate your cellphone? Microwave oven? Power cable tower? How many rem that you've been get for the past decade? Are you not going to use it just because of your baby?! Even you are not using it, we still have cellphone base stations install every where. How are you going to deal with it?
Oh yes, and Y5 zone. It's everywhere, subway, coffee shops, flats right next to you. How are you going to take care of those? Perhaps a radiation-proof suit?
The bottom line is, as we are talking about one-millionth (if not one-billionth) of one rem. I wouldn't worry that much. But, if you have a big concern of your health (or you kid) and take those hoax as serious as it claimed, don't bother with a wireless router.