Hi there

My kids have done that took though i am not sure how old they were but my nana was constantly telling me off for it because she said it will damage their legs.

I think it may be an old wives tale of sort especially if you asked you in-law who would know id think and they confirmed no issue. I wouldn't worry too much everything that is good for them is bad and everything bad is good. I hope you get that!!!

see ya
Sheryl