Yeah they have simethicone specifically for infants. You should use that instead.
Having just passed the cusp of my second child's colic (10 weeks old), let me just say: we tried the simethicone gas drops this time, and they don't do jack squat to help the kid with their colic/gas. Their guts are just brand new and have a lot of uncomfortable adjusting to do. Infant probiotic worked well for us with both kids - Udo's Choice Infant Probiotic is worth the steep pricetag if you can find it in your local Whole Foods (obviously ask your pediatrician first)