My wife wants to go back to work a month after delivery.

You should tell your wife what is going on indoor mind. But, I think you let her make the final call. May be, she doesn't want to give up her career or thinks that too many leaves might leave her out of focus and would be difficult for her to join her job later. Many women give up their career after delivering and many go through depression of staying at home. Perhaps, she is already feeling depressed being at home. Try to figure out why she wants to join so soon, and if she can work out a few more leaves from the office it will be great for the baby as well for the health of your wife.