Congrats fella, but you really havent thought everything through have you.......
1. Have a home birth - that way she can pick and pack up till the last couple of minutes.
2. Once rested, you can wake her up half an hour before the Post office closes in order that she can take the parcels for dispatch.
Now if you deviate from the above, it will show her that you have compassion beyond the norm, and it WILL get used against you in the future
Now correct me if I am wrong, women are built to give birth, and can imagine it to be similar to having a big poo, yeah, it stings but really no biggy, 5 minutes later everything is 'fine and dandy'. Do you get sympathy when you have 'man-flu'? If the answer is 'no' then no sympathy is required, and what is more important keeping you customers happy or your wife??
Also you dont mention the age of child no. 1, and remember they are never too young to assist with running of any business, even from the age of 6 months, they are capable of licking the envelopes
No need to thank me for all of this awesome advice, this is what I am here for, showing males the error of their ways.