There are many synonyms for the term "baby girl" that can be used to describe an infant or young girl. Some of the most common synonyms include "infant daughter," "newborn daughter," "toddler girl," and "little girl." Other options might include "tiny princess," "cute cherub," "sweet angel," or "precious daughter." Depending on the context in which the term is used, there may be many other synonyms that would work just as well. Ultimately, the choice of synonym will depend on the writer's personal preferences and the tone of the piece they are creating.