As always, make sure your child for whom you have any concerns for hearing or language issues get an audiology hearing exam. Not just the pediatrician's quick screen. My son has a 70 dB loss in his ear (85 dB is totally deaf, so it's a huge hearing loss) that was missed at the yearly pediatrician's visit. I finally asked for an audiology exam in the soundproof room, and that is when it was discovered.
He's successfully worn a hearing aid for the last 4 years and has done fantastic. Just FYI.