It’s definitely a good idea to read about adults who are intersex, and find out about their experiences.
It sounds as though it is likely that this baby will appear to be a boy, and will be happy with this. But try to listen to it, and keep an eye on whether “boy” (or girl, if that’s how it all seems to start) keeps feeling like the correct description for your child. It could be that as your child starts to get to know themselves better, they decide that the gender assigned to them at birth doesn’t fit properly. If this is the case, they need to be listened to, and the gender they feel like needs to be respected.
It sounds like they have an equal claim to being a girl, or to being a boy - their XX chromosomes say “girl”, and the Y chromosome says “boy”, so if you don’t manage to guess correctly when they are born, you certainly don’t need to feel embarrassed, and can readily justify “changing their gender”.
The important thing is to listen to your child, and believe what they tell you about themselves (except for the times they insist that they are an elephant firefighter from Mars; that might just be fantasy!).
It is important to keep away from as many surgical interventions as possible. As long as they can urinate (the page you linked to didn’t seem to suggest this should be a problem), their genitals are good for now. Strange as it is to think about this now, you really don’t want to diminish their capacity for sexual pleasure when they are older, which surgeries can do. Also, if you agree to a gender-affirming surgery before they are old enough to confirm that they are happy with that gender, you might be taking them further away from where they need to be. They will be able to have surgery when they are older, if that is what they want.
If I were to be in this situation, I’d initially pick a gender based on what it’s genitals look like, then keep an eye on what the child thought about this. I’d call the child Robin, because that name suits girls and boys equally (I’m not suggesting you call yours Robin - it’s on my list of baby names, and would also honour an uncle).
I know it feels like a big deal, but this is just a child like any other. It just needs to be loved and accepted, like all other children. Your baby isn’t defective - just different. They will be marvellous and amazing and adorable. You will do a brilliant job raising them, I’m sure!
Let me know if you want me to try to find any specific resources about intersex issues. I found an amazing website a while ago, which I could probably find again.
Good luck! 😁