Switching Formulas Question

Kailyn • Navy wife + mom of 2

LO is on enfamil newborn (we have enfamil gentlease we were going to use too) we just got WIC checks for Similac advance. The lady told us a healthy baby doesn’t have issues switching between formulas and my son doesn’t seem picky yet. Anyone have any input on switching between formulas? Or Similac advance period?