Impact of Meeting Early Hearing Detection and Intervention Benchmarks on Spoken Language.

Grey et al. (2022) tracked preschoolers with hearing loss who were served by the Early Hearing Detection and Intervention (EHDI) program. The team asked which EHDI steps—newborn screening by one month, diagnosis by three, or early-intervention enrollment by six—best predict later spoken-language scores.

They used existing records and language tests, not random assignment, to compare kids who met each benchmark with kids who missed it.

Only one benchmark mattered: children who were enrolled in early intervention by six months posted higher spoken-language scores later. Meeting the screening or diagnosis deadlines alone did not lift scores.

In short, getting the child into services by six months was the single critical timing factor.

Vivanti et al. (2016) saw the same younger-is-better pattern with the Early Start Denver Model: starting before 48 months produced bigger verbal gains for kids with autism. Both studies flag age at program start as the key driver.

Guthrie et al. (2023) ran a randomized trial and proved that autistic toddlers who began parent coaching at 18 months outscored those who waited until 27 months. Their causal data back up Brittany’s correlational finding that a nine-month head start (or a six-month one in EHDI) yields larger language gains.

Långh et al. (2021) shifted the lens to program quality, showing that higher-quality EIBI predicted language gains in preschoolers with autism. Taken together, the message is clear: start early and start well—timing and quality both count, but timing is the gatekeeper you can’t fix later.

If you work with infants who have any developmental red flag—hearing loss, autism, or global delay—use the six-month enrollment finding as your advocacy tool. Push pediatricians, insurers, and families to lock in services before half-birthday, not after. Track referral dates in your intake sheet and flag any child who is still waiting at five months. One quick phone call or letter can move a child from the missed-benchmark group to the higher-language-score group.