Any advice on hair thinning ? 🆘

I have medium length hair past my shoulders. my hair length seems to be growing good. At a slow rate since having my second child but still good. 👍 my issue is that around my scalp, mostly the front of my hair, my hair seems to be thinning bad. I see a lot of baby hairs growing? But also bald spots? I can’t help but notice it. And it’s more noticeable if I try to wear my hair back (in a ponytail, clip or bun) What could be causing this type of hair thinning? At the front of my hair If anyone is knowledgeable on the subject I’d love some tips or even better some supplements that have worked for you 😌 - I workout 3x a week and I eat a balanced diet - I cut my hair into a bob 2 years ago so my hair is all mostly new hair I haven’t colored it or put harsh chemicals. - I rarely put heat on my hair but I am GUILTY of wearing my hair back everyday. I don’t do my hair so wearing my hair in a ponytail or a clip helps me look and feel clean without hair in my face.