NTT Infant Speech Database (INFANT)

Data DOI

Producer, Project

Shigeaki AMANO, Tadahisa KONDO, and Kazumi KATO, NTT Communication Science Laboratories


Speech data spoken by Japanese native 5 infants from 3 families are recorded more than one hour per month since their birth till 5 years old; completely spontaneous speech.


Japanese native speakers including the parents and their children (2 boys and 3 girls of 3 families).

Speaker IDAge (months)Period (months)Time (hours)RepetitionsFrequency
A0–3025161316≥ 1 hour/month
B0–5450140720≥ 1 hour/month
C0–60616839815 minutes/week
D0–60616629015 minutes/week
E0–5950106691≥ 1 hour/month

Speech file format

WAV format (16 kHz, 16 bit, Mono)

Distribution media



For research and development purposes only


11 000 yen (plus consumption tax for a domestic order)

Speech sample for test listening

Girl / Recording period: 0–60 months

at the age of 0 month 
at the age of 12 months 
at the age of 24 months 
at the age of 36 months 
at the age of 48 months 
at the age of 59 months 

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