She (30) isn't happy with how he (30) decorated our nursery, how do I get him to change it?

My wife is about to have our first child, and she has been excited about decorating the nursery for months. Before she was pregnant, she showed me a design she liked which was a forest with lots of greens, blues, and other natural colors. The room would have a lot of cute forest animals.<br><br>I ended up decorating the nursery instead, as she was sick the last few months. I ran out of time, so I asked my brother (our best man) to help finish the nursery. He helped me, but he also changed the design to a Harry Potter theme.<br><br>My wife is upset about it, because she has wanted a forest nursery for so long. I asked my brother if we could change it, and he said "I don't see why, Harry Potter is great! It's a good idea, I came up with it."<br><br>My wife also says I should have asked her before changing the design. She definitely told me it was fine if I were to give my brother some work to do, but it's clear to me she didn't mean let our friends change the design. I don't want to call her stupid or anything, because I still want her to be confident in what she knows, but she's currently pregnant, so I don't want a topic that might make her uncomfortable.<br><br>I just need to know how to explain to my brother he needs to change it. He has never been good at listening, so I will need to say just the right thing.<br><br>Edit: I didn't mean to imply my wife can't do anything. I understand the nursery is mostly for her. She isn't feeling the best right now, so I wanted to do as much as possible to get her through this. I thought she would be happy that I got it mostly done, but now she wants a different design. She told me to ask my brother to change it, but I just don't want to fight with him.