A nice deep seat will make a huge difference to keeping baby secure, as well as making sure the sling is spread across their body in thirds. You’ll want a third of the sling bunched under their thighs, extending from knee to knee. The middle third wraps from their bum all the way up to their shoulders, and then the top third should gather at the base of their neck. Finally, be sure to bring any slack to the rings before tightening to help keep tension and a secure carry.
A couple of helpful video below!