Ohio’s rare mono mono twins that made headlines around the world when they were born holding hands, have been making good progress and will soon be able to leave hospital.

Jenna and Jillian Thistlethwaite, who were born on 9 May at Akron General Medical Center, are reported to have both gained weight.

Mono mono or monoamniotic twins, where identical twins share the same amniotic sac and placenta, occur around once every 10,000 pregnancies.