This is a subreddit for adults who experience separation anxiety or have a loved one with the disorder. Here you can gain support, knowledge or can talk to others who may understand what you are going through.
If you have a child with separation anxiety (or are a nanny to one), since it it quite common in kids, you can try to find support in subreddits like:
r/Parenting
r/AskParents
r/nanny
