Girls, help! For the last three to four days, the baby is not himself.…

Girls, help! For the last three to four days, the baby is not himself. He's terribly fussy when we put him to sleep... During wakefulness, there are no problems, he's cheerful and playful, but as soon as bedtime approaches, he cries, he doesn't want on my arms or in the stroller, he turns away from the breast and won't take it, while you carry him upright, he calms down, I put him back and again a wild crying... Yesterday he ate very little, he drools a lot and scratches his mouth with fingers. Could this be teeth? There are no colic or gas, everything is fine with his tummy... What could it be? I'm at the limit