Mine finally stopped shedding a week ago. Bubs is 4.5m.
I was literally crying every time i had a shower. I couldn't run my hands through my hair without chunks falling away.
Although I love my thick pregnancy coat my hair is delightfully manageable again.
Hubby kept teasing and every morning saying it looked like id given birth to a mouse or a small rat - from all the hair in the shower drain.
What a darlin' that my DH did the cleaning up
I hope yours stops soon x

ETA; I also don't think your DS is eating them - it's just that when you put a clean nappy on you can't see the hair stuck to it, or that falls in etc, but when you're checking out their mustardy curdy poop it is so much more visible