Individuals with sex chromosome trisomies (SCTs) have an increased risk of language delays and impairments. However, there are only a few data relative to their language development in early childhood. The present study aimed to investigate the preverbal skills shown by a group of 8-month-old children with SCTs to assess the presence of a possible early communicative delay. Moreover, the predictive role of early preverbal productions on later lexical development at 24 months was analysed. Twenty-six children with SCTs and 24 typically developing (TD) children participated in the study. Their use of vocal productions and gazes addressed to the communicative partner was assessed during a parent–child observation session held when the children were 8 months old. In addition, the children’s word comprehension at 8 months and their word production at 24 months were indirectly assessed by a parental report. Children’s word comprehension was similar in the two groups of children, whereas a significantly lower frequency per minute of gazes was found in children with SCTs than in TD children. A significantly lower proportion of children with SCTs showed the ability to produce babbling during the observation session, and significant differences were also found in the frequency of babbling utterances. No significant differences emerged among the subgroups of children with different types of SCTs. The predictive role of babbling on later lexical size was found in TD children but not in children with SCTs. This result could be probably explained by the small number of children in this group who could produce babbling utterances. The study leads to identify early signals of delay in the preverbal skills of children with SCTs. Early monitoring of their communicative development could help the clinicians in intervening with well-timed and targeted programmes.

性染色体三体性（SCT）个体的语言延迟和障碍风险增加。但是，关于儿童早期语言发展的数据很少。本研究旨在调查一组8个月大SCT患儿所显示的言语技巧，以评估可能的早期沟通延迟的存在。此外，分析了早期谚语产生对24个月以后词汇发展的预测作用。26名SCT儿童和24名典型发育（TD）儿童参加了研究。在孩子8个月大时举行的亲子观察会议中，评估了他们对交往对象的声音产生和注视的使用情况。此外，父母报告间接评估了孩子在8个月时的单词理解能力和在24个月时的单词产生能力。在两组儿童中，儿童的单词理解能力相似，而在SCT中，每分钟的凝视频率明显低于TD儿童。在观察期间，SCT患儿的比例明显较低，表现出产生bab语的能力，并且语的频率也有显着差异。在不同类型的SCT的儿童亚组之间没有出现显着差异。在TD儿童中发现呀呀语对以后词汇大小的预测作用，但在SCT儿童中却没有发现。该结果可能是由该组中少数可能产生produce语的儿童解释的。这项研究可以确定SCT患儿的言语能力延迟的早期信号。对他们的交流发展进行早期监测可以帮助临床医生干预及时且针对性的计划。