If you are going to breast feed your kid in public, go ahead. I doubt there is 1 person out of 100 who is going to pitch a fit.
But, don’t sit there and announce, loudly, that you are feeding your child with milk from your boobies. A rather loud women did that next to a family member yesterday and just would not shut up with the details about the milk her body was producing. And these were strangers she was bothering with the details.