Which of these 3 Australian-made slings to buy for newborn?

[suse]

Personally, I would not recommend the buckled slings, particularly if you are using a ring sling. You are unlikely to get any benefit in comfort or convenience from them compared to a ring sling. A pouch on the other hand, because it can be used quickly and easily, is more likely to be a good complement to your stash.

Although you are not considering a wrap (not necessarily a hug-a-bub) because of the perception that it will be too complex for ECing, many ECing mums favour wraps, and there are several ties that are suitable for ECing (where you pre-tie and just pop bubs in and out - ETA - snap Shades). Google babycarriersdownunder and thebabywearer - these have excellent babywearing resources!

Given that you intend to EC, washability will be an important feature of any carriers you choose, especially in the early stages (it's also handy to have multiple backups if you have a spewy baby). You can easily and very cheaply make a number of wraps from jersey cotton (which is basically what a hug-a-bub is), these, unlike an Ergo, wash easily, and unlike many mei tais, dry really quickly.

HTH!