First of all, the process involved in migrating to work in the UK as a midwife is no different from what nurses go through. You can read the details of that process here. However, there are a few differences as a result of the relatively lower demand for midwives.
IELTS has, effective, 4 January 2020, made changes to one component of the four-component test. The changes are minor and do not affect the content of the test. There will still be the four components of the IELTS namely listening, reading, writing and speaking. None of them will change in form or difficulty level or the skills they are designed to assess.