This is from a husband's point of view. It sounds to me like you are approching the discussion expecting an argument. So, your attitude is sending him signals even before you start.
never start a discussion right after waking up or before going to bed. Don't start with "we need to talk", just start.
If you are really having communication problems one possible way that might work is to make a list of the subjects, hand it to him and let him drive the discussion and the order of the topics.
Normally you should be conversing all the time, more than daily.
Talk during breakfast, do you eat breakfast together? IMHO You should.
Can you talk during lunch?, phone is better than nothing.
Who makes dinner? Cook together and talk while preping dinner.
(It's not always easy and takes even more communication, especially in a small kitchen)
About baby... don't forget to get a TID (ssn) for your baby as soon as it's born, you'll need it for filing taxes in less than 5 months. Do you travel? Is your passport upto date? Add your baby to your passport. (or add it to the discussions w/spouse who's going to file the paperwork?)
If he's really non-responsive, just let him know what you're going to do before you do it. Try not to let things go critical, even if he does. ( I know I do )
Good Luck.