Premature Birth and Speech: Corrected Age, Risks, and What to Watch
Babies born early are judged by corrected age for the first two years — a baby born 8 weeks early is expected to act like one 2 months younger. Preterm birth is a known risk factor for speech sound disorders, and a meta-analysis found preterm-born children score lower on language tests, with gaps widening to 12.
Use corrected age for milestones
The AAP advises adjusting a premature baby’s age to account for prematurity: subtract the number of weeks your baby was born early (40 minus gestational age at birth) from their age in weeks. During the first two years, corrected age gives a better idea of when to expect developmental milestones.1
| Born at | Weeks early | Actual age | Corrected age |
|---|---|---|---|
| 32 weeks | 8 | 4 months | 2 months |
| 34 weeks | 6 | 12 months | About 10½ months |
| 36 weeks | 4 | 18 months | About 17 months |
Corrected age examples (method from the AAP).1
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What the research shows
ASHA lists pre- and perinatal problems — including preterm delivery and low birthweight — among factors associated with delayed speech sound acquisition and speech sound disorders.2
A meta-analysis of studies from 1995 to 2011 found children born before 37 weeks scored significantly lower than term-born children on both simple language (vocabulary) and complex language tests, even without major disabilities and independent of socioeconomic status. The gap in complex language grew between ages 3 and 12.3
Voice can be affected too: ASHA notes longer neonatal intensive care stays and prolonged intubation were associated with more severe voice problems in premature infants.4
What to watch and do
- Track milestones by corrected age until 2, then by actual age.
- Make sure hearing was screened and follow up any concerns.
- Watch language as well as speech sounds, into the school years.
- If you are worried, contact early intervention (under 3) or ask for an SLP evaluation.
In the US, ASHA notes families can contact their local early intervention program directly to ask for an evaluation, without waiting for a professional’s referral.5
About SpeechStep and toddlers
SpeechStep’s practice is built for ages 4–8. For babies and toddlers, honest coverage hasn’t started yet: use the free milestone checker and join the waiting list instead.
Frequently asked questions
Do premature babies talk later?＋
They are expected to reach milestones by their corrected age, not their birth date. The AAP explains that for the first two years, a baby born 8 weeks early who is 4 months old should be expected to have the skills of a 2-month-old born at term.
How do I calculate corrected age?＋
Take your baby’s age in weeks since birth and subtract the number of weeks they were born early (40 minus gestational age at birth). The AAP recommends using corrected age to judge developmental milestones during the first two years.
Does premature birth cause speech problems?＋
It raises the risk. ASHA lists preterm delivery and low birthweight among pre- and perinatal factors associated with delays in speech sound acquisition and with speech sound disorders. A meta-analysis found preterm-born children scored lower on language tests than term-born children, even without major disabilities.
Do preterm children catch up in language?＋
Not always for complex language. In the meta-analysis, gaps in simple language (vocabulary) stayed stable, but gaps in complex language grew significantly between ages 3 and 12 — so monitoring should continue into the school years.
Put this into practice today
Try the free speech milestone checker, or start daily AI speech practice — every child takes one SpeechStep at a time.
References
5 sources from authoritative bodies. Last reviewed October 2026.
- 1.AAPCorrected Age for Preemies — Parent guidance (HealthyChildren.org).
- 2.ASHASpeech Sound Disorders: Articulation and Phonology — Practice Portal page.
- 3.Peer-reviewedvan Noort-van der Spek, Franken & Weisglas-Kuperus — Language Functions in Preterm-Born Children: A Systematic Review and Meta-Analysis — Systematic review and meta-analysis (Pediatrics), 2012.
- 4.ASHAVoice Disorders — Practice Portal page.
- 5.ASHAEarly Intervention — Consumer page.