Is it normal for little ones to go off their milk when teething and weaning? Liv usually drinks…

Is it normal for little ones to go off their milk when teething and weaning? Liv usually drinks between 6-7oz but last few days only been drinking around 4oz. She also still has boob.

Do u think its all a bit too much for her tummy. She was sick yesterday n a bit today. I cant tell if its the food,teething,milk or heat 😕😕