2 yr old obsessed with v*gina and bum hole

So I don’t know if this is normal as I’m a first time mom so I’m looking for advice. My daughter walked in on me changing a couple weeks ago. She pointed to my vagina and asked what it was so I told her it’s a vagina and that she also has one, girls have a vagina and boys have a penis. That was that. Now she knows where her vagina is and what it is. We got her the baby alive that poops and pees a few days ago. So it has a little bum hole lol. She asked what that was so we told her it’s a butthole and that’s how she poops. SNow she’s obsessed with looking at it, touching it, even kissing it. We don’t make it weird but we do tell her not to kiss it. She’s constantly asking to see the baby’s bum hole and sticking fingers up there. She’s also a bit obsessed with the baby’s vagina. I don’t know how to go about this? She plays with it all day. How do I approach it? I mean she’s just curious and learning so I don’t see a problem. Is there something I’m supposed to do??