Today I had the pleasure of working with a 4 year old, who walks with pigeon toes. We did a short session that consisted of 3 exercises and when she left, her gait was neutral.
Children can easily make high-impact adjustment and changes to their posture, before the bones/ligaments/muscles/joints/fascia are permanently patterned.
We think of these things as “congenital”, but many of them can easily be adjusted to allow the body more space to grow, before they are fixed.
If you have a child that slouches, hunches, or walks with “duck feet” or “pigeon toes”, consider a 30 minute session to set you up with some home exercises to allow their body to grow from a neutral position.