Hello everyone? Could you please tell me what might be going on? We us…

Hello everyone? Could you please tell me what might be going on? We used to sleep well, but for the past couple of days, he's been sleeping poorly during the day, only for about 20 minutes. He seems to sleep at night, but cries all through the night in his crib. He's become capricious and everything she doesn't like, even on her arms, she's being fussy.