I think the concern is aluminum’s affect on bones- but I also have read that it would take a LOT of maalox/mylanta with aluminum to affect the baby…mylanta cherry supreme doesn’t have any aluminum & so therefore many prefer it and it’s recommended by their ped GIs…HTH (hope this helps)
Laura’s right, it’s the effect that aluminum can have over time that people worry about, but our ped GI said that a baby would have to take in a huge amount of regular mylanta or maalox for the aluminum to be a problem.