In a stunning medical mystery, a nine-month-old baby can’t open his mouth.

The baby, Wyatt Scott, reportedly an extremely rare disorder called congenital trismus which doesn’t allow the boy to open his jaw.

“It can cause issues of getting food in with any nipple or bottle feeding and it can also have trouble for the secretions, so they often have associated swallowing difficulties,” said a Canadian doctor familiar with the situation.

The condition first appeared just months into the child’s life when doctors realized he was repeatedly choking.

Congenital trismus, which is extremely rare, is usually caused by an extra band of tissue or a fused joint in the mouth. However, recent CT scans show this is not the case for Wyatt.

“Nobody that we’ve found has seen anything like this before,” Andrew Scott told ABCNews.com. “Hopefully, somebody will see it and will have some ideas on how we should go forward.”

r. J. P. Vaccani, who is treating the boy, said doctors would continue to examine the child and seek a solution to the medical mystery.

“It’s an unusual situation where he can’t open his mouth, and there’s no kind of obvious reason for it,” Vaccani, a pediatric otolaryngologist at Children’s Hospital of Eastern Ontario told ABCNews.com. “Otherwise, he’s a healthy boy.”