Sling Baby Sling

So I've been doing more research on baby things.
How am I going to carry Baby?
In a pram, in a sling, a capsule, or just like that...?

At the moment, these look really practical.

Picture from http://bearhugbaby.com.au/shop

Something like this would be so easy to use, but they cost just over $90. And what if baby grows bigger? Maybe some babies don't like the sling after they get to a certain age, or...? I just have no idea...

Hmm...