2- Exception: France ( republican certificate, Citizenship granted at 18) and Bahamas ( Travel document with parent citizenship, Bahamian Citizenship granted at 18) .
NB: I make a generality which applied to US and Canada where it is automatic ; then an exception France and Bahamas where it is not automatic. I tell you the appellation can be different from country to country. This doc is used legally as a birth certificate by example France when parents are foreigners, they don't give a BC but a document called republican certificate which states that the person is born in France with all the information as a real BC. Bahamas as well. When turns 18, the citizenship is granted.
Did you see that part again?
I apologize for returning to this but this is also incorrect, at least with regards to France. (I apologize because I have spent time in France, so of interest to me, and clearly I also have some OCD issues).
It's quite clear France issues birth certificates to children of non-French nationals:
https://www.weka.fr/administration-locale/dossier-pratique/etat-civil-dt21/etablir-l-acte-de-naissance-d-un-enfant-ne-de-parents-etrangers-1354/#:~:text=Oui, la naissance d'un,état civil français territorialement compétent.
"Le fait que la mère et le père de l’enfant soient étrangers n’a en principe pas d’incidence sur l’établissement de l’acte de naissance."
The 'titre d'identité républicain' is not a replacement or issued instead of a birth certificate. (Apart from the fact that it is no longer issued). It was - and its replacement, the Document de circulation pour étranger mineur
is, an identity document for certain travel in and out of France/the Schengen zone for minors without French citizenship. It does not attest to birth (can also be issued to those born outside of France), but to situation in France allowing circulation within the EU and back to France without a visa.
https://www.service-public.fr/particuliers/vosdroits/F2718
https://fr.wikipedia.org/wiki/Titre_d'identité_républicain_en_France
Now, none of the above should be taken as any kind of advice about French birth certificates or citizenship law. But no, it's not true that France issues some other kind of document than a birth certificate for foreign children. (There is an oddity of French law compared to some other countries, as I understand, in that France issues
acte de naissance both for children born of French citizens abroad
and for those acquiring French citizenship later i.e. naturalizing; odd only in the sense that some get an 'acte de naissance' that is not really about birth, but French identity, being metaphorically reborn I guess as a citizen of La République.)
So, like many other countries, jus soli or jus sanguinis - a birth certificate
may tell you something about citizenship; but not always.
NB: When you born in a country in which the citizenship is not automatically granted=NON JUS SOLI JURIDICTIONS they do not give you a birth certificate, they give a document of birth( Attestation of birth; however you call it) which is legally equivalent ( NOT EQUAL) to a birth certificate. .. Off course there may be exceptions; but not really false or wrong.
Again, this is false. I repeat, I'm in a country where the birth certificate is identical in form and name whether the child gets citizenship or not. So far we have: Canada. France - as documented above. Russia. UK. Perhaps there are some countries where they issue a different document, but you have yet to show one. (I can't find any confirmation of your claim that the Bahamas issues a different birth certificate to children of foreign parents, either).
As far as I can tell, ALL european union countries have similar rules to France regarding birth certificates: they must be issued to all children born in that country; regardless of citizenship (the EU and European insitutions on human rights etc do note issues with administration, but NOT some fundamental difference in approach).
https://index.statelessness.eu/sites/default/files/ENS-Birth_registrations-StatelessnessINDEX_briefing.pdf
(You'll note this reference doc uses the general term 'birth certificate' throughout including for France.)
You say 'of course there may be exceptions' - but your claim is far broader, that 'when you're born in a country where citizenship is not automatically granted, they do not give you a birth certificate, they give you a 'document of birth.' (Which again, is known as a birth certificate in common usage anyway).
So no, as far as I can tell: this claim is far too broad (and basically meaningless anyway if they give you a 'document of birth.') Many, many countries issue birth certificates, including to non-citizen children, under the same name as a 'regular' birth certificate.
Again, my point has been relatively simple: birth certificate
alone is not universally proof of citizenship; it depends on jurisdiction.
(I did overstate my point rhetorically that 'nowhere has a separate document' for non-citizen 'documents of birth' - I'm not aware of any. I have yet to see a jurisdiction where it is demonstrably the case that there is a separate document, but sure, there may be one.)
Again, apologies, this is a bit deep in the weeds and a product of my OCD + habitual insomnia.