Hello I have gone through your complaints. The green color stool what your child passed at birth is meconium which is the normal color to pass.
A 1.9 yr old child to drink 250ml at a time is a large amount. There is no need to worry about if your child is gaining weight adequately. There is no need to worry if his weight is in between 10-12 kgs.
At present I think your child is suffering from viral infection. You need to get evaluated with your child specialist.
Thank you. Good day. Get well soon

Hello
Cry in a newly born baby indicates initiation of breathing. Delayed cry only does not fulfill the criteria of birth asphyxia. Also based on severity of birth asphyxia which is suggested by a constellation of symptoms one can explain the long term prognosis.
Passing green potty at birth is quite normal. One has to rule out its entry into the respiratory tract which can be problematic. If there is no respiratory distress during initial few days then it rules out the aspiration syndrome.
Now as your baby's development is normal till date it is unusual to effect its growth further.
Present fever, cough and vomiting may be due to some viral infection. Give him paracetamol to control temperature and consult your physician for further evaluation.
Regards