Wow. These hacks have really been taking me down memory lane. I, too, had some scares in the hospital, no doubt magnified because I was recovering and hormonal and (!) a new mom. Great advice, Sara.
I find myself giving this advice to anyone who is expecting: Take your pediatrician's office number to the hospital. Anything you're told that makes you worried or stressed, call and ask for their advice. Assuming you've done your due diligence and found a doctor you like and who has a good call-back policy, you can probably talk to a nurse within a couple of hours.
This would have saved me a considerable amount of trouble as a new mom, being told by the nurses in the maternity ward that my daughter was losing too much weight and any number of expensive and stressful things must be done to ensure she nursed and didn't lose more than 10% of her weight. Fast forward a week, when my pediatrician told me that she's the doctor, and she only *starts* worrying when they lose 10% of their weight, and that she thought my daughter would have figured it out given a little bit more time. Grrr. You may understand my anger when I tell you this locked us into a bottle feeding/breast pumping cycle that lasted for months.
You never know what's going to happen at the hospital — but being prepared to call someone else for medical advice is not a bad thing.