if you are giving formula milk to the child you have to see that it is easily digestible for the child and is not causing more gas formation as well as colic pain. you you have to meet your doctor who will guide you how you can choose formula milk for your child. there are many brands available and you can go for any one of them which is not causing digestion problem for the child

For now you can use Nanpro or Lactogen no issues but I advice you to continue breast feeding the baby. If you continue to breast feed then only more and more milk secretion will be there.

Yes u can if affordability is the issue otherwise nan pro is better

U can switch to LACTOGEN 1 .But I suggest you Try giving more breast milk.