Background B‐Cell CLL/Lymphoma 11B (BCL11B) is a C 2 H 2 zinc finger transcription factor that has broad biological functions and is essential for the development of the immune system, neural system, cardiovascular system, dermis, and dentition. Variants of BCL11B have been found in patients with neurodevelopmental disorders and immunodeficiency. Materials and Methods Whole‐exome sequencing (WES) and clinical examinations were performed to identify the etiology of our patient. A variant in the BCL11B gene, NM_138576.4: c.1206delG (p.Phe403Serfs*2) was found and led to frameshift truncation. Results We reported a male patient with developmental delay and cerebral palsy who carried the BCL11B variant. The detailed clinical features, such as brain structure and immune detection, were described and reviewed in comparison to previous patients. Conclusions The BCL11B‐related neurodevelopmental disorders are rare, and only 17 variants in 25 patients have been found to date. Our report expands the variants spectrum of BCL11B and increases the case of neurodevelopmental abnormalities.