I'd like a baby carrier that I can just on my front and as a backpack as baby gets bigger. I've seen the Infantino Flip Ergo 4 in 1 Baby Carrier which seems ok and is reasonably priced but I didn't know if I was missing anything obvious. Do I have to take my (short) height into consideration so it fits comfortably? Are there any other nice baby carriers that aren't extremely expensive? Help please