What began as a small, unusual eye movement in a newborn soon led to the diagnosis of an exceptionally rare neurological condition that has changed one family’s life forever.

David and Siobhan Smith, from North Wales, welcomed their son, Rupert, in May 2025. Aside from minor breathing difficulties after birth, he initially appeared to be a healthy baby.

But at just a few weeks old, his parents noticed something unusual.

His eyes would suddenly flick from side to side or up and down before becoming fixed in one position. Soon afterward, Rupert began having episodes in which his entire body stiffened, leading doctors to investigate several possible conditions.

Early tests, including evaluations for epilepsy and other neurological disorders, did not provide any answers.

Then, when Rupert was six months old, he experienced a life-threatening medical emergency that required his mother to perform CPR before he was rushed to the hospital.

Further genetic testing finally revealed the cause.

Rupert was diagnosed with Alternating Hemiplegia of Childhood (AHC), an exceptionally rare neurological disorder caused by a genetic mutation. The condition can trigger sudden episodes of weakness or paralysis, seizures, and other neurological symptoms. Episodes may be brought on by everyday factors such as fatigue, temperature changes, illness, bright lights, loud sounds, excitement, or emotional stress.

There is currently no cure, and treatment focuses on managing symptoms and reducing complications.

Today, Rupert receives care from a large multidisciplinary medical team that includes specialists in neurology, respiratory medicine, cardiology, physiotherapy, speech and language therapy, nutrition, hospice care, and community nursing.

His parents say life has become completely unpredictable.

“We’re on edge all the time,” Siobhan said. “One minute he’s smiling, and the next he’s having a life-threatening seizure.”

Even common childhood experiences can trigger serious episodes.

During one recent period, Rupert experienced around a dozen seizures over 48 hours, which his family believes may have been triggered simply by teething.

His parents now carry emergency medications and oxygen equipment wherever they go and carefully monitor him throughout the day.

“We can’t let him become too tired, too H๏τ, too cold, or even too excited,” Siobhan explained. “That’s one of the hardest parts.”

Despite everything he has endured, Rupert continues to greet the world with determination and a smile that inspires everyone around him.

As Rupert approached his first birthday, his family began raising funds to travel to the United States in hopes of accessing emerging therapies and supporting ongoing research into the condition. They have also pledged that additional funds will help organizations working toward better treatments and, one day, a cure.

“Time is incredibly important,” Siobhan said. “We remain hopeful that new treatments will continue to emerge.”

For David and Siobhan, every day brings uncertainty—but also graтιтude.

“We’d do anything for him,” David said. “He’s such a beautiful little boy. Everyone who meets him falls in love with him because he’s so incredibly resilient.”

Although Rupert’s journey is only beginning, his courage continues to inspire those around him, reminding everyone that even the rarest diagnoses cannot diminish the strength of a child’s spirit.