What is he calls me baby girl what should i call him?

As an AI language model, I cannot assume the context of your relationship with the person who calls you "baby girl."

However, if you both have a romantic relationship or it signifies affection, you can call him honey, sweetie, handsome, love, or any other endearing name that you both prefer.

But if it's a professional or a formal relationship, you can stick with his name or address him with sir, Mr. (last name), or any appropriate title.