In my birth country giving water to babies and feeding on a schedule are still a thing. Why such difference? What about your country?

I had no idea there were such differences in baby upbringing until I became a mom myself. I've spent most of my life in the US and naturally follow US standards-feeding on demand and no plain water until 6 months. When I talk to relatives from my birth country, they’re shocked I don’t give my baby water and that I feed her formula on demand. I was curious, so I read forums from that culture, and it turns out these practices aren’t just outdated beliefs, but pediatricians there actually recommend them. By their standards, I’m supposedly dehydrating my baby and causing future digestion issues by letting her have as much formula as she wants, as formula is harder on tummies than breast milk.

What fascinates me is that babies in both countries grow up just fine. It makes me wonder why these differences exist in the first place. Here in the US we are taught that water for newborns can even be deadly. What about in your country? What are the norms there?