How is he eating my hair all the time?

My boy is 7 months old. I never notice him eating or chewing my hair. He sleeps under the covers by my stomach, yet most walks I’m pulling poop with my hair stuck in it out of his bum. I vacuum twice a week. I can’t figure out when or where he is eating my hair. He is crated while I’m at work and goes to doggy day care 2x a week. He does have free roam while I’m at home. I checked his toys, I saw more of his hair than mine. I wash his pillows and blankets once a week.

How do I make this stop? I don’t mind so much, but it’s annoying and I would imagine not good for him. As a baby I would notice him chewing my hair in bed, I figured he would grow out of it. I thought he had as I don’t see him do it anymore, but the hair in the poop doesn’t lie!