Re: stretching and signs that HD will set on later
i see it multiple times a dayand always have. i can't say for sure that your boy doesnt have HD, but i can say that the stretching you describe has nothing to do with it. i'd limit him laying on hard floors tho, its not good for any joints. i have to have beds upstairs, downstairs and outside so that my kids always have a soft spot to lay. i have 1 with hd and 1 w/o.
i see it multiple times a day