The hearing standard for a 7-month-old baby is hearing within 25 decibels is normal. For 7-month-old babies, hearing within 25 decibels is normal, 26 to 40 decibels is mild hearing impairment, 41 to 60 decibels is moderate hearing impairment, 61 to 80 decibels is severe hearing impairment, and more than 80 decibels is extremely severe hearing impairment. If your baby has difficulty hearing each other’s words when communicating with people in your life, you should go to the hospital in time for appropriate diagnosis and treatment. If your baby has a mild hearing impairment and it does not affect your baby’s life, you can choose not to use hearing aids, but you need to have a checkup every six months or so. If your baby’s hearing impairment is more serious, he or she should receive appropriate treatment and wear a hearing aid.