Possible injuries leading to cerebral palsy (e.g. strangulation by umbilical chord or other causes)?

(Is strangulation a possible cause?) -- Is there more knowledge now (compared to forty years ago) that allows a doc to understand that an injury is occurring, and/or are there newer techniques (in the last forty years or so) to deal with it (to prevent cerebral palsy). (Especially interested in techniques around the birth to halt the injury).