www.amazon.co.uk/Ozbozz-First-Wheel-Skates-Girls/dp/B00FWWCB6W/ref=sr_1_8?s=kids&ie=UTF8&qid=1416354487&sr=1-8&keywords=roller+skates
On rollerskates.
Recommended age: 6 months to three years.
Now obviously I think the DCs are exquisitely advanced for their age, but even they could not have rollerskated at six months old. How worried should I be :o?