AITA for saying my sister's children are too old to still get a baby gift basket every year?

I (32f) am the oldest of 5 kids. My parents have always said that when it comes to birthday and Christmas gifts, they want to make sure all their kids get treated equally. Because of this, I, and many of my siblings have a smaller collection of personal items that I've had since I was younger, compared to my siblings who got more because they came later. <br><br>A couple of years ago, my sister (28F) and I were talking on the phone, and she asked why I didn't have very much Disney stuff. I explained that I'm the oldest of 5, and she has more because she's the 4th, whereas I'm the first. She said that it's not fair that I explain my things away to my younger siblings, and I said no, they're our siblings, they're supposed to get things when our parents gave them out. I felt like my parents made sure everyone got something, and I understood where my sister was coming from, but it still bothered me that she was upset, so I offered to let her pick a few things I had, and she took some Mickey Mouse Clubhouse stuff and a Frozen cup. <br><br>The next year, I got together a baby gift basket for each of my nephews and nieces. I spent a little extra on the one for my sister (40 baskets in total), and she got a cup and mug from Mickey Mouse Clubhouse, and a Frozen hairbrush. I felt bad that I didn't have any of the more popular Frozen things, but I didn't want to take them away from my little sister who still lives at home. <br><br>This happened every year for the last 5 years, until I got married a few months ago. My husband and I decided to do something different, and instead of a basket for each, we'd get one big basket for the kids to share. We spent a bit more on it this time, and added a few more things for my sister, like a candle holder and a picture frame. <br><br>When I posted the picture on Facebook, my sister texted me and said that she was disappointed we didn't get each of the kids a basket this year. I said that we decided to do one big basket this year and a few more things for her, and she said it didn't feel special because we didn't give each one a whole basket. I asked if she'd rather we went back to that, and she said no, but she felt like the extra things didn't compare to a whole basket. I said that I didn't have the things she wanted, but I grabbed a few things and spent more money, and I thought she'd appreciate it. She said she didn't, and asked if I expected her to say thank you for the Mickey Mouse Clubhouse cup. <br><br>I was pretty hurt by what she said, and I asked if that's what she thinks of the cup, why is she upset over the Frozen hairbrush? She said she knows that cup is nice, but she's had it for 5 years, and it's time for something more. I said fine, but she's welcome to it if she doesn't want it, and I asked if she wanted me to get a whole basket for just her. She said she didn't want it, and she asked if I expected her to keep the Frozen things and give the other kids the Mickey Mouse Clubhouse stuff. <br><br>I asked her what she wanted me to do, and she said she doesn't care, but she's done with the baby baskets. I said fine, and she said that she's done with me too. I asked why, and she said she doesn't want a relationship with someone who feels she's entitled to more than her siblings. <br><br>I told the truth and said that I didn't think she is, and that I think she's being unreasonable, but I don't want to get into a fight over a cup. She's barely talked to me since then, and she's been very cold to me when she has. I think it's ridiculous that she's upset, but I wanted to know if I was in the wrong here.