So mama says the kid only watches TV through a lead shield?
There seems to be a core people who insist on believing and propogating tales about the ill effects of almost every thing "electric," and it has proven mostly impossible to convince them otherwise by rational arguments or by rigorously conducted tests.
While it is possible, if you search hard enough, to find a very few scattered reports in applicable peer reviewed publications that claim evidence of "effects," if you read the reviews and subsequent independent trials, there have been none that survive more than - usually - a few months.
A very recent report by a qualified high school student who used his father's consultant credentials to get supervised access to hospital equipment and terminally ill cardiac patients claims to have demonstrated that an iPod held within 5 inches of some pacemakers can "affect" the pacemaker**. Journal reviews aren't in on this one yet, but it was reported on MSNBC so everybody knows its true. That's about the best I can do for anything that actually supports dear muther.