Pay attention to the products you receive for your baby !!! Nickel; silver imitation, bright, white color, hard metal. Nickel is an easily processable metal and is often used because of its low cost. For this reason, it is also used in the manufacture of snap fasteners and zippers in metal jewelry and unfortunately in baby products. Nickel is the most common cause of allergic contact dermatitis called allergic skin rash (allergic contact eczema) and is a major problem for your baby.