i don't go into hysterics so to speak when I see a child sitting that way but if we are doing an activity I make sure they are sitting properly with their legs out in front of them usually or directly under them with legs together. I have a 15 month old right now that has dislocated hips and is beyond flexible but of course unsteady. She has a harness she used to wear all the time but by the time she started care she only needed to wear it at bedtime so one less thing for me to deal with in daycare but I do have to be conscious of how she is moving since she can so easily move in ways that will damage the progress already made. My own daughter has special needs and ankle issues. She pronates in to the point of walking on the insides of her feet and has AFO supports to correct it or at least minimize it but she has gotten where she doesn't like wearing them so time to get them recasted probably. Her heel cords were very tight as a baby and she could not make an actual foot so we did a lot of exercises to push the foot up into the correct position while massaging the the area just above the heel. All of her muscles are weak/over flexible - called hypotonia so she does fall sometimes for no reason and can not support herself with her arms when she does - she takes a full face plant in the true meaning but at other times the muscles will tighten and her arm strength is really good she just can't sustain it for long periods of time unless she is upset and adrenelin is doing half the work. I have another child in care that W sits all the time but again his range of flexibility is so great that he can sit in ways the average person can only dream of so it is hard to correct him. I also like to have them sit at the table for lessons instead of on the floor and then it gives all of the muscles a chance to work in a different way. Again I don't think anyone mentions these issues to parents until after the habit is well established as opposed to a doctor telling them ok when your child reaches this milestone start watching for him to do this and start correcting it because...