Does anyone have experience with voice analysis of 8-15 month old infants?

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Antonio Rico-Sulayes

This is a thesis, in Spanish, and for newborns, but it may point you in some direction.

http://catarina.udlap.mx/u_dl_a/tales/documentos/lmt/morales_s_aa/index.html

At least the references should be useful:

http://catarina.udlap.mx/u_dl_a/tales/documentos/lmt/morales_s_aa/bibliografia.pdf

Daniel Dobos

Hi Samantha,

Have you tried Praat?

http://www.fon.hum.uva.nl/praat/

Daniel Hirst

Do you know this paper?

Shigeaki Amano, Tadahisa Kondo, and Sachiyo Kajikawa 2001. Analysis on infant speech with longitudinal recordings The Journal of the Acoustical Society of America 110, 2703 (2001);

https://doi.org/10.1121/1.4777322