I had a infantino carrier when Hailey was around 2 -3 months old. She hated it with a passion and I couldn't get NOTHING done carrying her plus it hurt my back and felt like I was being pulled DOWN in the front
At 6 months old I wanted to take Hailey out of her infant seat to put her in a convertible and didn't think she could sit up on her ow yet so I bought 2 slings.
I bought a pouch sling (was too big for mybody even at the smallest size). Then I bought a ring sling (adjustable) but I still did NOT feel comfortable carrying Hailey in it since she could almost pull herself out of it.
Luckily soon I discovered Hailey could sit up on her own and no need for me to carry her.
I would say a Ring Sling since its adjustable .. I felt comfortable carrying Hailey around the house in it (comfortable on my body) but didn't feel comfortable (safe) taking her out in public for long it due to her moving too much.
I have heard great things about a Mei Tei too .
I think this site is a bit expensive but they have some really cute patterns/fabric. You might be able to get one cheaper off ebay.
http://www.babyhawk.com/