No, wait till he turns 1 year. Even after 1 year, prefer Buffalo milk to Cow's milk

Yes you can. Give in 2:1 ration.  2 water and 1 milk. After 2 months 1:1. After 1 year completion of ur kid...you can give milk as is. Don't add any health drinks or sugar. Just plain boild and cooled.

<span style="color:#3B5998;"><b><a href="http://app.babychakra.com/article/210">Weaning Food Recipe (10 to 12 months)</a></b></span>

Not before your baby turns one year old.