I think that is partly an old wives tale...People always tell me not to cry a lot during pregnancy coz later my baby will be whiney..!!! But with my raging pregnancy hormones flying about in my system,i cant help but be emotional sometimes...Like dat time i saw this documentary on pregnancy..I cried when the mummy gave birth..SooOooo emotionally-moving..!!
I dont know if personality plays a part but i know for sure that the MTB's emotional state will affect the baby..So yeah..i guess we have to always be in the happy2 mode throughout the pregnancy..!!