As I type, my baby Piper is fast asleep at my side. Literally, she is on my hip in a cool contraption called the Ergo Baby Carrier. It's a gift from the Gods. It lets me walk around and do things, while being able to care for, see and cuddle my child anytime. She's warm against my body (and I'm warm against hers, keeping us both cozy), and she almost always falls asleep in the carrier. This is a device that lends a very important helping hand, making 3 people happy at the same time. But this device is not enough.
Our new incredible (Insert-Calming-Device-Here) can be a great tool for keeping your baby happy, but when that doesn't do the trick, what else have you got in your bag? Better be able to answer this question, and have a few extra tricks on top of that one. My personal favorite is the Rebounder Method. Basically, anything that you can personally do to keep the baby happy for 30 minutes at a time is what you're looking for.
I can't stress the point enough, you HAVE to find a way to get your baby happy without milk. Feeding is great, but you (if you're a father) don't have breasts and you never will. I know that hurts to hear and may be surprising to discover. If you don't have breasts, then you can't pump milk either, so that's another method you can't control. You must find a way that works for everyone (throwing baby in the air works for about 5 minutes, but doesn't make mom happy and can't be sustained for 30 minutes, so it's not a viable option). Do you have a rocking chair? A yoga ball? Strong arms? Figure something out, man. Ask your parents what worked for them to keep you happy/calm. Ask your wife's parents too. Get 5 techniques, minimum. I don't know how long the Ergo carrier or Rebounder Method are going to work, so I have a few more as backup. (The car idea is also not sustainable, just in case you're wondering. It works when it works, but you can't in good conscience drive your kid around whenever they are upset.)
Frankly, in addition to you as the father taking on new role as diaper changer (which I highly recommend you consider as, again, you cannot breastfeed), the Calming Technique Guy is pretty much your main new identity. Clearly, supporting your wife/partner in their calming methods is a good idea (getting them the tools they need when they need them), but your own worth as a father may be at stake here in the early stages of parenting. If I'm coming off sounding urgent or even desperate, it's because this is a very important understanding to come to.
If you have some favorite techniques for calming your baby, please post a comment, I will check this entry often.