Is there any jump or regression in sleep within 6 months? My calm boy …

Is there any jump or regression in sleep within 6 months? My calm boy became some kind of whiny child, crying and crying. He only wants on his arms, sometimes even this is not liked. Putting him to sleep is very hard, even outside sleep started to be 40 minutes long. Although he used to sleep 1.5-2 hours outside before. I don't know how to wean him off, he doesn't sleep on his arms at all, or in a stroller, or rocking on a pillow is needed. I didn't notice how they came to such a thing.