Most common type of twin pregnancy is:
In twins most common lie of both the fetus at term is longitudinal.
Rarest lie is both the twins transverse.

Presentations

Both vertex (Most common) 60%
Vertex (Ist) – Breech (IInd) 20%
Breech (Ist) – Vertex (IInd) 10%
Both Breech 8-10%

Note: Interlocking of twins is a rare complication seen in twins with Ist Breech presentation and IInd vertex presentation.
Vertex + transverse
Both vertex
Vertex + breech
Both breech