Has there ever been a recorded instance of Siamese triplets?
There has been only one confirmed case of conjoined triplets. Conjoined siblings occur only in monozygotic multiples. Triplets are most often what is commonly referred to as “a pair and a spare” meaning two are identical and one is fraternal. Two eggs are fertilized and one splits. Identical triplets are very rare, occurring in about 1/200,000 births. They are always the same sex. I am the grandmother of identical triplet girls born in 1998. They suffered from Twin to Twin Transfusion syndrome with one donor baby and two recipient babies. Their birth weights at 31/6 were between 1190gr-1759gr. At 10 years they are healthy, normal girls.