Prolonged numbness in thighs in a 7 month pregnant lady - Online Doctor Chats

Doctor :   hi
User :   anybody there ?
Doctor :   how can i help you
User :   hi this for my wife, and she is pregnant...can i ask some Qs ?
Doctor :   ok
User :   she is running 7th month now, the problem is throughout the day , her thighs (outer side) are felt numb and have very less sensation to touch...is it anything to worry ? why this happens ?
Doctor :   It is quite normal in pregnancy due to increase in weight and pressure over nerves
User :   oh ok..it it not bad ?
Doctor :   no
User :   to have prolonged numbness..is there any way we can avoid it ?
Doctor :   i suggest her to cahnge the psotures frequently
User :   ok..
Doctor :   change the posture frequently
User :   ok..understood.
User :   you mean ,while sitting, sleeping etc ?
Doctor :   while sleeping it is better to sleep on right side than on lying on back
User :   ok..why right side ? left side is not good ? can you pls explain ?
Doctor :   while sitting needs to get up at short intervals
User :   i see..
Doctor :   In the right side blood supply to the baby will be good
User :   i see.
User :   thanks Doctor.
User :   one more last Q.
Doctor :   and laso during pregnency there will be swelling due to weight gain leading to compression of nerves