My wife is having a tough time adjusting to motherhood and is cranky most of the time. I know she is going through a lot and I want to help her. What should I do to make her happy?

Be there for her physically and emotionally. Help her with house chores. Volunteer to take care of baby when you get home from work so she can rest and take some power naps. Talk to her. These are very simple things but they are the ones i appreciated most from my husband.