You raise them as best you can... Just like any other child! The poly thing they don't need the info till they are 14 or way over. And that's up to them as what they will prefer
How are you going to hide poly from a kid until they are 14 or over? More importantly....WHY?
From 0-14 or so... They will just Except their reality... As life! Somewhere in there they will become able to understand they have a choice to practice what might be best in their view.... Their choice to make...
Kids are much more aware than you realize, I think. I already have almost 3 year olds around that ask why their friends families or their family looks different than other ones.
The poly thing they don't need the info till they are 14 or way over.