Girls, we're on GVB. Yesterday the baby went to the toilet quite firml…

Girls, we're on GVB. Yesterday the baby went to the toilet quite firmly. The mass like clay in hardness. I haven't seen anything like this before. Is it constipation? At the same time, she had very watery stool in the morning. There was a lot of water, although we haven't had such a thing for a long time. Has anyone experienced something similar? Maybe some kind of allergy?