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I wouldn't worry about 10-15 seconds of feedback noise from a monitor when the child wasn't even in the same room. Even if the child was in the same room it wouldn't cause hearing loss as the amount of sound a battery powered speaker can produce isn't nearly enough to cause hearing loss, especially so short a period.

Is there a reason you want to overcome this? Is it a medical necessity? Is it harming him in anyway? It seems that it is just a way for him to cope, which can be a good thing. Unless there is some harm to the child, I don't see why you would want to fix this. Having said that, if it is really concerning you, offer him another way to cope. This could be ...

Generally it sounds like you don't have to worry. Did you hear the noise from a similar distance? Can you still hear? The human body is very resiliant. Your child will be exposed to a lot of noise over the course of his first few years, from popping balloons to the sound of his own voice or his brothers and sisters screaming. Don't worry about the minor ...

Short version: don't worry about it, but don't repeat either. Long version: Permanent damage is a function of exposure level and exposure time. Legal requirement for a workplace (OSHA) are 85 dBA for 8 hours, 95 dBA for 4 hours, 105 dBA for 2 hours etc. Pain threshold sits at about 115 dBA to 120 dBA. Some clinical studies suggest that these limits are ...

There's probably a study to support whatever theory there is you want to believe in. For this particular one about tv, here's one: http://www.parentdish.com/2009/06/08/study-finds-television-noise-delays-development/ I personally don't think it is true. But then I don't want to argue with statistics. However, the reason for my argument is that when the ...