> kids who are breast-fed tend to do better in life in terms of health or being better from a psylogical point of view

Not as much as you've been led to believe:

http://researchnews.osu.edu/archive/sibbreast.htm

"A new study comparing siblings who were fed differently during infancy suggests that breast-feeding might be no more beneficial than bottle-feeding for 10 of 11 long-term health and well-being outcomes in children age 4 to 14."