What is when to start calling her baby?

The decision to start calling someone "baby" is a personal one and varies depending on the relationship and individuals involved. Some people may start using the term as a term of endearment early on in a relationship, while others may wait until they feel a deeper level of connection and intimacy. It's important to communicate with your partner or loved one about what terms of endearment are comfortable for them, and to always respect their boundaries and preferences.