Girls, I have a very important question for you! Recently, my daughter…

Girls, I have a very important question for you! Recently, my daughter and I went to visit my mom. Mom lives in another city. We stayed there for four days, the baby wasn't sick there either, she was playing around. But after we came home, in the evening, when the baby fed with formula, she suddenly stopped and fell asleep. I thought maybe nothing would happen. At night at 2 o'clock, I see that the temperature rose up to 38. We are still sick. I wanted to ask, could it be because the baby changed place and got sick? It hurts and pulls. Today thankfully, there was no fever. What do you think, is it from this or from teeth?