Here is an excerpt I got from my Regional Health Unit re: the 101 on formulas:
"Follow-On Formulas were introduced in Canada in the mid 1990's, marketed towards babies 6 months and older. They are better at this stage than whole cow's milk, but have no proven advantage over other formulas. The implication that such products are somehow"scientifically formulated to baby's needs" is misleading. The biggest change to baby's diet during this time is the introduction of solid foods, providing a variety of nutrients from all food groups. Follow on formula may cost less per can than other formula, but the size of the can may be smaller too."
Hope that helps!!