Are au pairs registered childminders?
It would depend on the au pair. An au pair could simply be someone that has a good education and is good with children, or it could be someone who actually wants to work with children for their whole life and has taken the steps to become a certified care-giver. Try going through an agency that connects parents to au pairs, if you find one that has good reports/reviews, than you are more likely to get an au pair with references, certifications, and the appropriate licenses to help you raise your children.