The fundamental frequencies (Fo) of infant cries were analyzed to determine if mean cry Fo differed as a function of the infant's sex or due to the stimulus evoking the cry. Results indicate no significant differences in either; however, males exhibited a tendency to have higher mean Fo. (Author/KM)

A study is described, the results of which indicate that mothers can recognize the cries of their own infants from tape-recorded cry samples with few instances of confusion, and that the sex of an unknown infant cannot be reliably identified using a simple auditory identification paradigm. (Author/RM)