Sebastian Brokenshire-Dyke (left) and his twin Solomon
Wednesday 30 December marks ten weeks since Seb had SDR surgery in St Louis. Seb is now able to stand unaided for forty seconds.
"The other day he put his leg on the table during dinner - perhaps not appropriate but this was completely beyond comprehension before surgery," his family wrote on Facebook.
"Beyond all these physical achievements, our family is finally experiencing a sense of calm and simple joy.
"We no longer worry about the effects of spasticity on his growing body. We no longer fear for his future.
"We are confident he has the same opportunities ahead of him as his twin brother.
"We can relax and enjoy our family time and watch both of our sons enjoy the craziness of their toddler years. Seb is finally, finally, toddling!"
The family are asking people to sign a petition to make SDR available on the NHS. For more information on Seb and his family, visit their Facebook page.