Which country do you live in, and by what age do babies births have to be registered by?

I sometimes see questions from people who are panicking because a baby is un-named. In England we don't have to register their birth until they are 6 weeks old, while in Scotland they only have 3 weeks. Is it different in other countries?
Update: Selina and Suzy, I am glad I don't live in the USA or Netherlands. They don't give you much time.
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