Girls, what could it be? Son has been crying all night, didn't sleep n…

Girls, what could it be? Son has been crying all night, didn't sleep normally, feeling tired since morning Sucked on his breast, took a nap for 15 minutes, then energetic for 5-10 minutes, then again tired, wants to sleep, lying down Wants to play, but weak, no pace, no coughs or sneezes