Would you not want to have fewer children and given them more opportunities?
As campaigners for women's rights and improved access to family planning have found, time after time, women want exactly this, if they have control over their lives.
Low-income women of the UK aren't mindless, feckless milch cows, any more than women all over the rest of the world.
When women have the power to control their fertility, they do. Increase funding to women's health clinics, increase the opening hours, set them up so everyone has one within easily travelling distance, and hey presto! The birth rate drops.