Answer: He seems to be speaking less words and less frequently.
Step-by-step explanation:
The statement like speaking less frequently and less frequent words states that the child is more likely to suffer from autism compared to that of the cognitive behavior.
Not speaking in the complete sentences, others not being able to the understand the speaking of the child that how is he speaking, why is he speaking less are some of the smaller signs that points towards autism.
The loss to previously acquired skills is also stated as learning points towards the autism but not learning disability or cognitive development.