@Barbsjw - nice topic!
My son (7 y.o. soon) came into my life and I didn't feel quite well about my own shape and size back then.
When he was about two years old I remember during cuddling time he realized with his brightest smile what a perfect cuddling site my bellies are. I felt very uncomfortable.
Luckily some things changed and I started realizing about myself and how I want to rise my child about this matter. I don't want him to be insecure about his appearance. I try to raise him with values that are more important than having a big belly or a flat one. He should find people in his life around him who respect him for the person he is and not for his physical appearance. (an appearance that can change)
I also don't hide myself at home. It should be a save place. I am not a nudist either but nudity up to a certain point is normal here. (
@penguin... these shower moments... yeah... same here

)
I am on a good way I think. I don't know what will happen in future but I am convinced I created a basis for being okay in his own body. Even if he is a tall and slim boy he knows he is equal to other children, regardless their shape, size, gender, ethnicity... etc.
This week I overheard a conversation (and I know his statement made the other one very, very uncomfortable) when my son said... "you know, Mama has a very big belly and it is just the BEST to cuddle with!"
But he is not glorifying me being a fat mom - he also told me this week that he'd love to see me running.
In my opinion raising a child with a body positive attitude is getting difficult when parents don't accept themselves or at least tolerate their current appearance. I witnessed a conversation between a mother (BBW) and her daughter (a bit above average height and weight) when the girl wanted some more sweets. The mom denied and and explained: "I don't want you to be a big/fat child!"
I was kind of speechless.
I understand her fear. She doesn't want the girl going through what many fat children/young adults go through when they grow up. But telling her fat=bad wasn't appropriate and won't help the girl with accepting herself and growing self confidence.
Interesting question, @Barbsw. Thanks for things thread.