Conjoined twins are two babies that are born physically connected to each other.
Conjoined twins develop when an early embryo partially separates to form two individuals. Although two fetuses will develop from this embryo, they will remain physically connected — most often at the chest, pelvis or buttocks. Conjoined twins may also share one or more internal organs.
Most conjoined twins are stillborn or die shortly after birth. Some surviving conjoined twins can be surgically separated. The success of surgery to separate conjoined twins depends on where the twins are joined and how many and which organs are shared, as well as on the experience and skill of the surgical team.