Girls, hi! Has anyone ever encountered such a problem with their kids …

Girls, hi! Has anyone ever encountered such a problem with their kids as excessive sweating? Our little one started sweating profusely after we turned on the heating, even though I'm not wrapping him up at all. Especially when he sleeps at night, I change him three times and the place where he lies is also wet. He's been very lethargic, almost dry diaper overnight.