A bib is read as protection during a messy stage and as early dependence. On an adult in a dream it often points to feeling treated like a child or wanting to be looked after.
Has this come up in your dreams before? What was going on in your life then?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.