Language delay does not usually shadow IQ, but mental retardation may affect language function.
Language delay is a common type of developmental disorder during childhood development, and the main clinical manifestation is that the child has difficulty in communicating with others.
The causes of language delay include mental retardation, brain dysplasia, organic lesions in the brain (e.g. inflammation, etc.) affecting the language center, and neuropsychiatric disorders (e.g. autism, etc.), etc. All of the above disorders may lead to delayed language development.
Therefore, delayed language development generally does not affect the IQ, but if it is an intellectual development disorder, it will affect the normal development of language function.
If your child is found to have delayed language development, it is recommended that you consult a doctor immediately to identify the cause of the problem and treat the symptoms in a timely manner to avoid delaying the condition.