word frequencies to Japanese babies

[Jan Edwards]

Dear colleagues,

Marilyn Vihman's email concerning word frequencies to British babies
prompted me to send one out as well -- we are interested in any data
collected in Japan, giving Japanese words used frequently in speech
directed to infants of 6-24 months of age (or any age span therein).  We
would be very grateful to anyone who could let us know where to find such
data.

Jan Edwards, Mary Beckman, and Kiyoko Yoneyama