Hi, I had my daughters ears pierced at 5months, I would have had them done earlier but hubby was to scared that it might do damage.(an over protective dad of his first born LOL) They've never had an infection and were always commented on how cute they are, my daughter is 5.5years now and her school allows a pair of studs or sleepers to be worn(something I never considered). I think little studs look great on baby girls and your friend could get different colours for her girls which would help her tell them apart.