I grew up with an entirely white family, and because it never seemed like an issue to them, my mother and grandmother didn't talk to me about race as a child. For years, I've been thinking that that's good. Don't point out race, and there won't be racism. However, something a youtuber said brought back a couple memories and made me realize that NOT explaining to your child that some people are different races, but that doesn't make them any different from you, could lead to your child not understanding race at all. When I was 6 years old, I didn't know that Asians even existed, and so when a part-Asian classmate of mine tried to explain that his hair was black, not brown like I was insisting for some reason, I ended up yelling out "Only black people can have black hair", and we had to be separated. Later at 8 years old, I tried asking an Asian woman why she looked different, and she told me I was being very rude. 11 years old, and I could understand why some of my classmates were so much darker than me, and it bothered me a lot. When I was 12, I joined a chatroom that was part of a dressup game, and found myself faced with a group of girls throwing the N word at each other. Having no idea what it meant, but seeing that it was being used casually, I said it too. Immediately, everyone turned on me because my avatar was white, and one girl threatened to kill me. Another girl, much more patient, understood that I was confused, and explained the history of it, and of slavery.
So I think that not teaching your kids about race, and explaining why people look different and that it's okay, can lead to unintentionally racist comments. Nobody talked about it in my family, and nobody talked about it at school. It seemed like we were just supposed to already know, and I sometimes felt like I was the only one who didn't understand.
Of course, I understand now, and I do regret the things I said as a child, though I feel like if history classes were given to children early on, more kids would understand sooner, and not be as open to being misled by their own confusions.