Tom Petty said:
take some of your vacation, all of your sick time and a couple personal days to be at home the first week or two when the baby gets home.
True enough.
USE your vacation, holiday, sick and comp time. It helps a ton.
The Family Leave Act is great, if you can afford to take 12 weeks off without getting paid. When I was at one of my past jobs, I could afford it and took all 12 weeks without a single regret. Most can't.
My advice, if it's worth much, is to not take work home if you can at all avoid it. If it's unavoidable, try hard to minimize it.
Also, when your wife is ready, hire a babysitter once or twice a month and go on a date. You two need a break and time together just as much as you need time with the kid.
When you get a chance, hand your wife the car keys and a certificate for a local day spa. She's going to be beat, so reward her with a pedicure, facial, massage or something to take her mind and body away from the unrelenting task that is raising a child.
If you can afford it, hire a housekeeper to come in and attack the house so you and your wife can skip it -- even if it's just one time.