But many babies that fail hearing tests do not get the follow-up they need. About a third of the 76,000 newborns that did not pass their screening test last year did not get the further testing needed to determine if they actually have hearing loss, according to the Department of Health and Human Services, The CDC blames a shortage of audiologists and a lack of understanding on the part of parents. If a child doesn’t get a follow-up and diagnosis by 3 or 4 months, the problem isn’t likely to be caught until age 2 or 3 when it has started affecting language and social skills.