How do I prepare my dog for a crying baby?

I am currently 37 weeks pregnant and I am worried about how my 2 and half year old fur baby is going to react. Yelling, crying, or fighting really stresses my dog out. My sister recently had a baby in Jan. and when he would cry my dog would go hide and not come out for hours. He really loved him until he started crying a lot. He is still good with the baby but is more weary and not so eager to let him cuddle and touch him anymore. I know it's the crying that made him more cautious. Is there anyway to ease or train my dog to not get so stressed out by those types of things. My worst fear is that he ends up completely getting fed up with the whole baby deal all together and won't be able to be around them, which would probably result in placing him in a new home:( I would never want to put my pooch in a stressful situation or put my child at risk of any sort of danger.