Station

In terms of birth, station refers to the leading edge of the most presenting part of the baby and where it intersects the imaginary plane between the ischial spines of the mother.

In descending order, station is -5,-4,-2,-1,0,+1,+2,+3,+4,+5 denoting how many centimeters above and below the ischial spines the presenting part is.

In a breech birth, the bitrochanter diameter of the baby is used.