Describes the phonological acquisition of 129 monolingual Putonghua-speaking children, aged 1.6 to 4.6 years. Children's errors suggested that Putonghua-speaking children master four elements of Putonghua syllables in this order: (1) tones; (2) syllable-initial consonants; (3) vowels; and (4) syllable-final consonants. Suggests that the saliency of the components in the language system determines the order of acquisition. (Author/VWL)