1) For babies and children we use pure, homogenous, medical-grade titanium and medical-grade plastic earrings which are both considered the safest hypoallergenic earrings to use. For babies and children, you may switch into 14k/18k gold earrings after the initial 6-8 weeks. (We do not pierce babies with gold because, although rare, they may have a sensitivity to the alloys used in gold jewelry. A sensitivity to a medical-grade material is far less likely to occur.)
2) For teens and adults there is a choice of medical-grade titanium, medical-grade plastic and 14k/18k gold.