A limited blood supply and slow metabolism
MMR vaccine can be associated with risk of twitches in babies which is lower between 12-15 months of age. After that time risk of twitches is getting higher.
To personally establish trust with clients you can share any of your personal experiences. i would recommend to answer an questions give them alternatives and attempt to calm any nerves
Actions taken to avoid risks are proactive factors
All parts of a community that affect the people who live there.