Lots of spitting up
Most babies have some degree of gerd; they spit up! the question is, when is it a problem that needs treatment? Most doctors would say treatment is needed if baby is in significant pain from esophageal irritation, if baby spits up so much she can't gain weight, or if baby aspirates (chokes on milk and gets it into lungs).
Otherwise, "watchful waiting" until the baby outgrows it is best.