For those of you who baby-wear, when did you start doing legs splayed-out kinds of positions? The instructions say "when baby is fully stretching legs"- I'm confused. I think K's been stretching her legs since she was born?

If you used the Ergo, when did you stop using the infant insert?
K is still too young I think to go without the insert, but she's always flexing her legs now, when I try to put her in the K'tan. and ends up sliding sometimes in the Ergo Infant Insert.
ETA: I should say not sliding out of the Ergo, but she kind of wants to straighten herself in the insert sometimes.