white bumps over my baby's arms and legs?!?

cerys • 🌍👶🏼 - mama to carter 25.09.16 / instagram - cerysrihanna
does anyone know what these white bumps are? more have seem to of appeared, i have a doctors appointment booked for first thing monday but just wanted too see if anyone know before hand as it's making me nervous, they don't seem to bother my baby at all.