Some permitted under certain condition, some not. No text in the Quran or the sunnah prohibits sterilization. Sterilization as used today was not known to the early Muslims jurists. Most Muslims jurists today oppose permanent sterilization, except for serious reasons such as hereditary or transmissible diseases. Many Muslim jurists permit under certain conditions temporary sterilization.
Sterilization is voluntary with no imposition from anyone.
A. New concept, still evolving. Many views and practices. The size of the country. Bigger country are for family planning. Small country are against family planning.