Once You Bring Your Baby Home...
Don't worry about making a few mistakes. Being a good dad - just like being a good mom - comes with practice. The sooner you start holding and caring for your baby, the sooner you'll learn what she needs and what you have to do to comfort her. So cuddle her, talk to her, sing to her, read to her, and show her the sights, sounds, and smells of her new world.
Be a partner, not a helper.
After money, couples argue most about who does what around the house. The more responsibility you take on, the happier your wife will be, the happier you'll be, and the stronger your relationship with your wife and your baby will be. For example, you might want to explore some different scheduling options for work: getting into the office an hour or two early might give you and your baby a few relaxed hours together in the afternoons. Or if your baby is being bottle-fed, do your fair share of the feedings. You might want to work out a system in which the one who does the 3 a.m. feeding gets to sleep in (or gets breakfast in bed.)
Stand your ground.
If you're feeling left out, talk to your wife about it. Show her that you're serious about wanting to be an equal participant, and that you're ready and able to do the job.
Ideally, your baby should have nothing but breastmilk for the first six months. But nursing is sometimes hard for new moms. Make sure your partner gets plenty of fluids and rest, and encourage her every way you can by helping her create the right quiet atmosphere she needs to relax with baby and devote the time and attention required for breastfeeding. Think low lights and limited noise. Not only does the right environment put baby in the mood, but it also sends mom's body the signal that it's time to let the milk flow.
Don't forget your relationship.
Before you became parents, you and your wife spent a lot of time together, building your relationship. But now, your baby is the focus of nearly everything you do. Set aside some time every day to talk with your partner—about something other than the baby.