DS is 17mo and still just about folds in half without batting an eye. I'm thinking of putting him in gymnastics or baby yoga (if I can find it) so he can keep that awesome limberness as long as possible. Is your DC still uber-flexible? If not, when did they start to "stiffen up"?

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Re: When Do They Lose Flexibility?
Cam 6.6.10 - Autism, Global Developmental Delay, Mixed Receptive/Expressive Communication Disorder