Lately I feel that my wife is paying too much attention on our newborn. So much so that she doesn’t even say goodbye to me when I leave for work. How do I tell her that I feel neglected?

If shes not even saying goodbye this is a little strange. But for her to spend more time with a newborn is not strange. If you're really sure you are not reading too much into this, then you should chat with her. Or make a point of kissing and cuddling her goodbye when you leave for work.