I would not be worried as every child's development pace is different. But I would take my child to various social activities where he can try to be interactive and open

The child should be assessed by a Developmental pediatrician especially if the child has no eye contact...

yes .. i will definitely worry n seek fir help as well, if i cant do means

There may be other underlying issues best to seek professional opinion

Yes, taking care of your child's mental wellbeing is very important.

i think parents should be worried and take this seriously.

Could cause some anxiety for them when they start to socialise.

I will arrange playdates for them to interact with other kids.

Would bring my child out for more play dates with kids her age

Yup. Will do more outdoor activities involving interaction.