When the baby has a hearing impairment, the mother can pay special attention to the baby’s development in the hearing. If your baby is older than 24 months old, he often shows speech impairment and delayed reaction, such as: 1. asking others to repeat their speech; 2. turning the volume of the TV and radio to a high level; 3. tilting his head when watching TV and putting his ears close to the TV; 4. not hearing the birds; not responding to the ringing of the phone and doorbell. This is the time when the mother can send her baby to the relevant medical institutions for diagnosis and treatment. Risk factors for hearing impairment 1. family history of hearing impairment; 2. intrauterine infections: rubella, syphilis, herpes, cytomegalovirus; 3. head and facial deformities; 4. premature birth or birth weight < 2500 g; 5. hyperbilirubinemia; 6. history of encephalitis, meningitis; 7. history of ototoxic drugs; 8. history of perinatal asphyxia; 9. delayed language development; 10. head trauma; 11. History of otitis media, history of recurrent respiratory infections.