Reduced Mother Milk, Mother Milk Production Deficiency

 the teacher told us a story about a mother came to his clinic and said "Doctor i have got twins, i can't feed them with my own milk alone it will not fulfil their nutrients requirements. 

Doctor replied

 "Have you ever seen a weak, thin, innocent cat feeding several babies with her own milk, then why can't you feed your twins? aren't you better than a cat?

mother's milk factory is a factory which production capacity depends on demand.