B.H.
Breastfeeding may be better, but formula is safe and nutritional and there is NOTHING wrong with a mother who choses formula over breastfeeding or who stops breastfeeding early.
My daughter was a preemie, she wasn't gaining enough weight on my breast milk, she wasn't latching on because she was still learning how to suck properly so I pumped and pumped and I hated it. It didn't work for us. My daughter NEEDED high calorie formula.
I never had a problem with the quanity of milk either it came and came way more than baby even needed. But it wasn't doing anything for her.
And I did have a friend who breastfed her child til she was 2.5 and the kid had major issues with eating normal table food, looked incrediably unhealthy and wouldn't eat anything.
Now I'm pregnant with #2 and I plan to try and breastfeed again but we'll see what happens.