synostosis

Archie's condition - known as Sagittal Synostosis - means that as his brain grows, the skull cannot grow sideways to accommodate it.

Aist was born with congenital radioulnar synostosis, a condition leading to the abnormal connection of the bones in the forearm, the radius and ulna, according to the National Institutes of Health.

Matthew was born with a rare cranial birth defect called metopic synostosis, a condition that affects one in 15,000 babies, according to data from Boston Children’s Hospital.

His metopic synostosis caused a premature hardening of his cranial sutures, the joints between the seven cranial bones.

Metopic synostosis is a type of craniosynostosis, a deformity found in infants that changes the growth pattern in their skull.