Breast feeding is natural. Where would many of us be without it? So, too, is discreetly doing it in public.
What's unnatural is walking past someone on the beach, who is discreetly breastfeeding their baby, three times in order to film and share it on social media. It's straight from a scifi film about how to identify "Them!" It's an excuse to sell outrage for would be fame. But it has SFA to do with breastfeeding.