So frustrated with my sister. Sensitive topic

My sister just had her first baby (her name is Anna) and our other sister (they aren’t close at all) is about to have her baby. I’m pretty close with both of them though. I had a miscarriage a year ago and haven’t been able to have kids yet. Anyways, Anna is a “know it all” about every single thing that involves kids, babies, birth etc and it’s overwhelming. I get she wants to be helpful but she shoots me down and if you tell her she gets extremely defensive and says you’re not even a parent so you can’t have an opinion until you are. My sister is super nervous for birth and a baby and is worried she’ll never get over being anxious and I was trying to comfort her and tell her once the baby comes and she gets into a routine she will probably start feeling a little better. My other sister shut me down and said “no she won’t. The anxiety doesn’t go away it’s a mom thing you wouldn’t even know anything about”. I told her that everyone is different and just because she’s still anxious doesn’t mean everyone else will be and she just kept saying how I never actually had kids and so I don’t know what I’m talking about etc. it’s so frustrating that I literally can’t say anything that involves any type of baby or kid or she gets extremely rude. It’s also hard because I know I’m not a parent and I want to be so bad. Im just trying to comfort my other sister. When other people with kids are around she’s just rude to me in general about everything and looks down on me as a lesser person because I don’t have kids.