Joined: Mar 2009
Posts: 5039
different products
5/29/2016 at 11:08 PM
Those are very different products. Looking on the Pediasure website, they have very different caloric and nutritional profiles.
It states that the fibre (as well as the non-fibre Grow & Gain) version is specifically used for kids who have inadequate growth or can't eat solids. In other words, kids with medical needs. The sidekick version is to "balance out a picky eater's uneven diet". It has 1/2 the amount of calories over the other, 40% less fat and considerably less nutrients.
If you need the Pediasure Fibre for medical reasons, I would suggest a pharmacy like Superthrifty. If they don't routinely carry it, I'm sure they can order it.