Once baby has more head control, it becomes possible to alter the positions in which they sit. Practice in the house, and always re-adjust if baby feels unsafe. Remember that you need to be attentive to the safety of the carry.
Here, Noah is in a froggy carry, he's sitting like a little budda, slighly to one side. Remember, try and position baby above your tummy button. You should easily be able to kiss his head:
Noah and I at Tan Y Bwlch, Ffestiniog Railway
Here is a similar carry, but as he's older, his legs are out. He's facing in as the weather was quite inhospitable, and this position allows me to shield him, keep him warm, and be able to pull the sling up around his ears:
Noah and I at the Roaches Trig station, highest point in Staffs
A hip carry allows you to have your hands free to do something else, and have a close conversation with your little one.
Noah and I at Gun Moor Trig Station
If you have any useful links to add, get in touch!
http://www.huggababy.co.uk - Huggababy website, plenty of hints and tips.
http://www.slingmeet.co.uk - Find your local sling meet and try some out!
http://www.thebabywearer.com - A babywearing forum and guide.
http://www.naturalmamas.co.uk - A site about natural parenting