nanocephaly

例句：

1. 1. The baby has a nanocephaly due to a congenital brain defect.
   这个婴儿患有先天性脑缺陷，因此有小头症。
2. 2.The child's condition is caused by a rare genetic disorder that results in nanocephaly.
   这个孩子的状况是由一种罕见的遗传病引起的，导致小头症。
3. 3.Researchers are studying the causes of nanocephaly and its impact on cognitive development.
   研究人员正在研究小头症的原因及其对认知发展的影响。