Women who have poly-cystic ovarian syndrome (PCOS) can have problems with milk production, if they're lucky enough to have kids to begin with.
This condition can has also been recently investigated as a cause of colic in kids who feed on the breast-milk.
Some use formula as their only option.
I breast fed my second child for only nine months. The little darling was a biter. I tried formula and she cried and threw it up. This was 30 years ago. Too young for cows milk, we lived near a dairy that sold goats milk. My little darling loved it! She drank it until she went to school. Actually, goats milk is better for children than formula or cows but never than Mama!