Where the record lives
Your birth sits in a register at the Comune di Torino, held by the civil status office. Nobody sends the register abroad; what travels is an extract the registrar prints and signs today. Every extract is therefore a new document with a new date on it. That single point explains most of what follows.
Short extract or full copy
Anyone working out how to legalize a Birth Certificate has to pick a version first. The short extract gives the bare facts of the birth. The full copy reproduces the register entry, parents included, along with notes added later such as an adoption or a change of name. Ask the reader abroad which of the two they mean.
Guessing here is expensive. A consulate will not upgrade a short extract for you, and the Italian stamps already on it are wasted once the version is wrong. So put the question in an email and keep the reply. Then order from the Comune with their words in front of you.
The Prefettura counter
To legalize a Birth Certificate in Turin you take the fresh extract to the Prefettura. That office is the state's local arm in the province, and register extracts are the administrative papers it deals with every day. Its clerk holds a sample of the registrar's signature, matches yours to it, and stamps the sheet. Without that mark no consulate will look at the page.
Papers made by a notary or a judge follow a different route, through the Procura della Repubblica at the tribunal. A birth extract is not one of those, so the Prefettura is the right door. Knowing which door saves a wasted morning in a city where the two are far apart. Bring identity papers and the tax stamp with you.
The freshness trap
The embassy legalization of a Birth Certificate in Turin fails more often on the date than on anything else. Because the register can be annotated after your extract was printed, foreign desks treat an old sheet as unreliable. Many will only take one issued within the past few months. Order the extract as late as you dare, not as early as you can.
What it costs and when it lands
The consular legalization of a Birth Certificate in Italy is not an expensive chain. Money-wise, expect the €16 marca da bollo on the Italian leg plus whatever the consulate charges. The Comune asks little for the extract itself. What costs real money is running the chain twice because the version or the date was wrong.
Allow 10–15 business days for the standard route once the extract is printed. An express run of 3–5 business days exists for fixed dates such as a wedding. Consulates keep their own diaries and can hold a file for reasons they do not explain. Book the appointment first, then order the paper to land just before it.
Uses, language and limits
The embassy attestation of a Birth Certificate in Turin turns up behind almost every family filing abroad. It is asked for to marry, to claim citizenship through a parent, and to enrol a child at school. Pension offices and estate lawyers want it too, to prove a line of descent. Each of those readers keeps its own list. Match the version to the list rather than to habit.
Whether the consular step is needed at all rests on the destination, and only the receiving authority can settle it. A single-step certification is the end of it for some countries; for others the full chain applies. Ask them, in writing, before you buy the last stamp.
Nearly all of these files end up needing the text in another tongue. Confirm the required language with the receiving office in writing, and ask whether they want the translation bound to the extract or kept loose. A short extract is cheap to translate, which is one more reason to know which version they want. Order the translation once the version is fixed.