Get a Moby!! For real, it is the BEST way to wear a newborn..plus have 2 free hands! I don't like slings for that reasons b/c I feel they aren't totally in there when I have to chase after my older children. But w/ a wrap they are so snug and secure you can totally chase and grab those little ones! Plus I can do laundry, clean, and even pick up and diaper my older ones while having her sleeping away in her wrap. I was told by many babywearing expert mamas to get one...and I am SOOOO glad I did (it was worth every penny and then some for how it has helped us out!) plus you can bf in it easily and wear them (as a newborn) in many different ways, unlike a sling. And it does NOT ever hurt your back. I found w/ a sling it would hurt after a while, but not w/ a wrap b/c it distributes the baby's weight evenly across your back. I wear her for HOURS and it doesn't even phase me...and or her!
here's the link:
www.mobywrap.com
I have a moby D b/c I like the panel of fabric in the middle, keeps them more snug and secure, plus our particular one has fleece and we live in Seattle so it's working great for the chilly weather)
good luck! and give a wrap a try, they are easy to learn and use...I learned really quick and was new to babywearing pretty much. I put it on at the house so all I do is load her in when we get where we're going