One year old “throw up”

My one year old and I went to target today, and she randomly spit up in her hand. Then when we got home a coupe hours later, she spit up on the floor. It’s not a lot, and she has thrown up before but this is actual spit up.

I should add that she has never spit up before, no diarrhea, is eating fine, and acting fine. Any ideas on what it could be?