She changed her clothes...

So my SIL watched my daughters today while I had a doctor appointment. I came back and she had changed my youngest (4month) clothes. I asked why and she told me she spit up on them....? I checked them out when I got home and they look perfectly clean. She's 5 months pregnant. I feel like her child is going to go through an explosive amount of clothes if she's going to change him every time he spits up.

Edit: wow you guys are feisty, I just thought it was odd. My SIL has a weird thing with "vomit" which I'm pretty sure is why she did it. I simply thought it was odd, I'm not bashing her I just didn't see the point. This is my third child and they've all had decent acid reflux, if I changed their clothes every time the spit up I'd have no clean clothes by the end of the day. This will be her second child so she's not a new mom per se. Again though not bashing her or shaming her, I guess I just thought it was odd so I posted. Forgive me.