Micra K13 – Funny sound immediately after launch

Hello, the Micra (80 hp) of my girlfriend is now about 5 months old and has about 4500 km on the clock. Since yesterday he makes a funny noise shortly after the cold start. Immediately after the cold start, when the ignition key is released again, it squeaks briefly (about half a second) from the engine room. It sounds as if the V-belt squeaks. When the engine runs about a minute and restarts again, the squeaking no longer occurs. What could that be? Starter, V-belt or or or? Greeting sia-freak