Syllable‐like utterances produced by 14 different infants aged 1–40 weeks were presented to two trained listeners. The listeners first transcribed a portion of the data phonetically. They then compared transcriptions, attempted to resolve disagreements and decided upon conventions to be used. One hundred and twenty‐two additional segments were then transcribed by the listeners independently. On 71% of these utterances the listeners disagreed in their transcriptions of syllabic nuclei. The remaining 29%, upon which they agreed, were all transcribed as mid or low front. Their judgments, where they disagreed, were always vowels adjacent to one another within the vowel triangle and were also predominantly heard as mid or low front vowels. The vowels at the extremes of the triangle, /a/, /u/, and /i/ were not judged to be present at all. Ten vowels upon which the judges agreed and ten upon which they disagreed were analyzed by conventional spectrographic and by computer‐assisted spectral techniques. The results of these analyses will be discussed. [Work supported by NINCDS.]