I found out the hard way that most Mei Tais are too wide for the baby to face out - I cut off circulation to my babes legs! They were all purple! I checked here and found that I wasn't the only one to have done that. You can face them out with the kangaroo carry, though - with their legs tucked in. You just can't do it bjorn style.
Some mei tais have smaller bodies or adjustable bottoms so babies can face out with their legs out - two coming to mind are mei tai baby and babies beyond borders. As a pp suggested, you can also scrunch the mt bottom up and baby's legs are fine.
I occasionally had DS facing outward from a very young age (like 5 weeks young) in a mt with a headrest. He could peek over the top and I had to lean backward a bit so his head didn't flop about.