How many children between the ages of 2 to 3 years old are deaf or have hearing loss? Are there hospitals for these kids?
According to the National Institute on Deafness and Other Communication Disorders (NIH), 2 to 3 children out of 1000 are born deaf or hard of hearing (at least 95% of them born to hearing parents). Another 2 to 3 out of 1000 will become deaf or hard of hearing by age 3 due to severe otitis media (ear infections) or other illnesses/accidents.
It is unclear why you might think they need hospitals, other than for the usual medical reasons, but there are audiology (e.g., for hearing aid fitting) and speech-language clinics (for those who will use spoken language rather than or in addition to sign language) in a variety of settings including medical centers, universities, and private practices.