My LO is 7.5 months old.. I wanted to start to introduce chicken (introduced fish so far).. Do we need to give organic chicken meat ? Those in supermarkets are not organic , right ? Or is okie to jus cook using the chicken meat bought from the supermarket ?

It is totally fine to give the ones from the supermarket. What is important is how you handle and cook the meat. Just make sure that it is thoroughly cooked and that during preparation, fresh meat or its juice does not touch surfaces which can be in direct contact with your baby like plates. Organic is good but they are expensive and non organic is just as good :-)