RJA 2A: Research Topic

How much can a fetus be affected by outside influences in the womb?  

I chose this subject because it is somewhat fascinating.  The psychological development of a fetus during this stage is controversial.   I have had many friends give birth recently and they, for the most part, have handled pregnancy differently.  Some women may eat unhealthily listening to every craving their body has, while others may eat extremely healthy and control themselves.  Exercising is another aspect that women struggle with,  some argue that it is best to keep with your regular schedule while others can say it is harmful.  My question is more environmental though,  as in the sounds and feelings the fetus feels while in the womb.  I would like to research the effects of different genres of music during pregnancy and also the effects of temperament.  If the mother tends to get angry or emotional more often, what is the fetus most likely to do?  

My knowledge of fetal development is rather elementary, I truly do not know much other than here say.  Through different documentaries and family friends I have heard theories though.  My mother for example did not eat junk food while pregnant with me,  but developmentally I'm not sure what that did because I still love junk food.  Another example would be a friend of mine who has two boys.  With the first boy she ate whatever she wanted and caved to every craving or urge she had.  With the second boy she watched what she ate and exercised more.  Now that those boys are older,  the first child is more temperamental and wants immediate gratification, the second child is very easy-going and mild tempered.  

I do not know all the facts of fetal development, but it is something I would like to learn.  There may be many resources that debunk my theory but I'm hoping to find more that support it.  I don't know if studies have been conducted on the matter but am interested to find out if there is something substantial to this hypothesis.