AITA couples wedding shower and my infant

So I am in a wedding and just had my first baby 2 months ago. The wedding couples shower is next week and I just got a text saying from the bride saying it’s adults only and I cannot bring my baby to the shower. If I lived close I wouldn’t mind leaving the baby with a family member for a few hours but the shower is 5 hrs away and we need to travel so of course I need to bring the baby. He is also exclusively breastfed. The bride and I are super close so this was definitely a shock as she was well aware of how young he is and that I need to travel so far, she just assumed I would Be leaving him for an entire weekend.

I planned on bringing my MIL for the wedding so that he would have a babysitter as well as be much older by then, but am I wrong to think I should be able to bring my young baby to the shower? I don’t mind not going to the event do to this issue but then I know a she would be upset I missed it… feeling a bit caught in the middle. I need to do what’s best for my baby and that means staying with him and close to him.