phonemes in early lexicon - reference

[suse]

hey there,
could by any chance someone point me to research about the frequency of 
various phonemes in children's early lexicons? i vaguely remember that 
words with initial "b" are overwhelmingly frequent. but i can't find a 
reference - is there one?

thanks a lot
Suse


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Susanne Grassmann
University of Groningen

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