Breast feeding may not alter older kids' health

Likely.

"Exclusive breast feeding for up to 6 months, though beneficial for an infants' immunity and mothers' weight, may not alter children's health risks over the long term, study findings hint...

n the current study, which assessed the children's outcomes through the age of 6.5 years as reported by their pediatricians, mothers, and teachers, the only observed between-group differences were slightly higher measures of body mass, hip circumference, and thickness of the skin at the upper arm - all indicators of greater overall body fat."

Overfatness is caused by one thing and one thing only - more Calories in than out.

Breastfeeding will never prevent that (past a certain age).

The whole breastfeeding and obesity thing is, IMHO, inflated by groups/persons with an agenda.

Concern yourself with the Calories.

That will always work.