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I;'m not sure what you mean by 'doesn't have a desire to learn'
But take a look at this link HERE as it gives a very good breakdown of stages of mental development for healthy infants and toddlers.
If your child's pediatrician is not concerned about developmental delay, then I would take this as a very reassuring sign, and since YOU are concerned, I would definitely bring this up with your child's physician.
My suspicion is, at 13 months, you may be overly concerned, but when you are able to enter the chat we can talk more about this.
I am going to check back shortly for you.
are you there?
can you be more specific about your concerns? have you brought them to your pediatrician's attention?
i would not at all be concerned at this point simply because your child may not, at this point, be able to do what his cousin does.... some children develop their speech more quickly than others, but this is nothing bo be concerned about by itself.
this sounds very normal for a 13 month old
as you can see form the link above
milestones for kids are very wide ranging...
as each child is different
and the fact that your dhild mimmicks the sounds you make is very encouraging... your child IS developing his speech, and it is way to early to worry about this...
you are most welcome