Because you have had a larger than average number of births, you are now classed as a grand multiparous woman. Some say this is the case from your 5th baby, and others will define it as after your 5th baby it really depends who you ask. The general consensus is that there is an increased risk of some complications, and yes sometimes positioning can be a part of these complications. If you google "grand multiparous risk" there are loads of papers written on the subject on both sides of the fence. The main thing to remember is that if you have an issue with a baby whose lie is unstable (moves around a lot from head down to transverse) then that does come with it higher risk or cord prolapse but you will know this before you go into labour. The chances of you having a perfectly normal, beautiful, complication free birth are very high so until a complication occurs then there is no need to be too concerned. Have a read up on the issues and make a list of specific questions for your care provider about how they recommend your care is amended if at all to reflect your higher parity but above all enjoy your pregnancy.