Milk will help with mild heartburn, but if you have severe reflux it will just make it worse. My midwife and later my maternal-fetal specialist said it was fine to take Zantac. You need to avoid any fatty foods because they will also make it worse. I don't think I could have survived my pregnancy without Zantac (I got the generic because the name brand is expensive). Also I swore by Rolaids because they have a better texture and taste than Tums.
Carrie (28), wife to Mark (31), mama to identical twin cuties Ethan and Ryan (27 mo.)