D.D.
It's a hard age because they don't know how to express their frustration well and everything seems to frustrate them. I had great luck with my kids by pretending to be very concerned but not being able to understand. "What did you want honey? I can't understand you. Can you use a nice voice?" The minute they would use the correct word I'd say something like "Oh you want some milk. Now I understand. Thanks for using a nice voice so I'd know."
Congrats with your upcoming little one. Children are such a gift.