Talking about your feelings is important, especially if you're expecting a baby. Be honest, open and vulnerable with them. Letting him or her know how much you love them and how excited you are for the baby you are having is a great way to strengthen the relationship between the two of you.
Don't be afraid to talk about anything or everything that comes up in the conversation, no matter how uncomfortable it may feel at first! If they tell you something makes them feel uncomfortable, don't take it as an attack on their feelings; instead, see if there's a way for both of you to work through whatever is making either person uncomfortable so that everyone can move forward together in a healthy way.