Our expert says:
The only reliable way to assess such a situation would be for the child to see a good child psychologist, or maybe better to start with a paediatrician.
Close comparisons with another child isn't the best way to assess her progress, but it's fair to say that if she broadly matched the other child, and then fell conspicuously behind, there might be some grounds for concern.
A common and often overlooked reason for the situation you describe is not a psychological problem, but a child who is deaf or hard-of-hearing, who doesn;t hear what is said to her, obviously limiting her capacity to learn, without special care, and reducing her abolity to respond to others socially.
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