So long as his back is at least part-way on your left, it is better than being along your spine or to the right. Babies have quite a few positions they can be in before the birth and its just like looking down on a clock for example - where every position is jsut a bit closer to 12. Google "katie belly rose' which is a diagram showing all the positions that baby can be in during pg. Not sure if there is a link to it from the spinning babies website