The debate rages on with natural health supporters and practitioners who claim that natural breast feeding is much healthier for babies than commercially-produced formula.

Aside from health benefits, researchers in Sweden believe that breast feeding may also lead to less stress in those who are fed that way as babies.

9,000 kids from the UK to -- all born in 1970 -- were observed to provide researchers with the conclusions they were looking for. All were given a "anxiety level" rating by their childhood teachers. Parents were also asked about major life events such as divorce that happened when kids were between the ages of 5 and 10.

Although some non-surprising results were found, there was one surprise: striking differences were found in stress levels between kids who had been breast-fed and those that had been bottle-fed. One is a natural nutrition source connected to a mother: the other is an artificial device that mimics the breast. Which would you prefer as a baby?