This little boy was cared for by a nanny from birth - 1 year. He was placed in my care in August. He crawls only, and will occasionally pull himself to stand - but does not "cruise" along furniture. He does not interact well with myself or the other daycare kids. He will either 1. play quietly by himself away from all the others, 2. sit in the middle of the others and cry, 3. angrily crawl after the others who try to include him in play and try to scratch them. 
He is a fourth child, and his 3 older siblings are in K, 1st, and 2nd. Mom admits that he is not around other children his age often, and has been held "all his little life."
To provide an example, I'm currently observing a 2 yr old little girl sitting next to him trying to include him in play with blocks and he's refusing to look at her and is as still as a statue in between intermittent bouts of crying. I make attempts to show him how to play and I do not get much of a response.
Is this just severe under-socialization - or should I be concerned and bringing up potential developmental delays with mom?

He is a fourth child, and his 3 older siblings are in K, 1st, and 2nd. Mom admits that he is not around other children his age often, and has been held "all his little life."
To provide an example, I'm currently observing a 2 yr old little girl sitting next to him trying to include him in play with blocks and he's refusing to look at her and is as still as a statue in between intermittent bouts of crying. I make attempts to show him how to play and I do not get much of a response.
Is this just severe under-socialization - or should I be concerned and bringing up potential developmental delays with mom?
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