My hair is a very good barometer of my body's health. If anything goes out of kilter my hair falls out. I do recommend seeing a trichologist if you can. I saw a wonderful one and she was brilliant. If you're in the northwest PM me.
It sounds to me like it isn't breakage, but is a very short hair growth cycle as another poster says. The baby fine hair sounds like miniaturisation. Hypothyroidism is a classic culprit. Other stuff to check is your iron, your vitamin d and your vitamin b12 because they also can screw up your hair and yet are incredibly easy to fix.
For me one of the biggest causes of hair loss was low oestrogen going through early menopause. I had several episodes of telogen effluvium. When my level plummeted I lost a quarter to a third of my hair one summer. I can track these episodes to the oestrogen deficient episodes that preceded them.
But that was dramatic hair loss and it was completely resolved with HRT.
The baby fine hair which won't grow as long as the other areas is something I still experience, at the sides of my head above my ears and temples. My gut feel is that this type of pattern might be thyroid related.
The other thing is to bear in mind a 2-3 month lag between a hair loss trigger or a remedy like her, and the point at which you can observe it in your hair.
Whatever your hair is doing today was caused by an event maybe 3 months ago.
For me this meant oestrogen plummeted in April/May. Hrt commenced early July. Hair loss started a week later and of course I panicked that the hrt was the cause, but the hair cycle can't work that fast! The hair had shocked out of anagen growth back in April and was only now falling out (telegen effluvium). Hair loss slowed in September, after almost 3 months on hrt.
So try to think in those timescales if you can.
Your hair is lovely and shiny by the way!