Read about head-down fetal positions here. Go to the Breech section to read about head-up babies.
The Belly Mapping how-to article may give you clues to your own baby's position.
The baby is oblique when baby's head is in the mother's hip. The baby's body and head are diagonal, not vertical and not horizontal (transverse lie). This is fine for a second twin. But oblique is not an optimal fetal position for a singleton baby after 30 weeks gestation.
Baby is head down and the back is to the side- The right side. This position can be deceptively reassuring. ROP is the most common of the four posterior positions.
The ROP baby has the forehead in the front, lined up with the symphysis pubis and bladder. Little baby hands are likely to wiggle on both sides of the center line (linea nigra) just above the pubic bone area, but below the mother's navel.