I have a 17 month old girl who seems to have trouble hearing at times. If we are one on one at home she will follow instructions easily. If we are around other kids or she is engrosed in something, it doesn't seem to matter how loud I yell she won't respond to me at all. I can't tell whether she has already learnt the art of selective hearing or is genuinely having trouble hearing in a noisy environment. I intend to get it checked out but was wondering if any other Mums were noticing similar problems.