Sonic's birthplace depends on the continuity.
Canonically, Sonic's birthplace is considered to be Christmas Island.
However in other Sonic universes, his birthplace differs.
In the Archie comics, Sonic is born in Mobotropolis.
In the Sonic Underground series, Sonic is one of the triplets who are born to Queen Aleena on the planet Mobius.
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According to the Sonic the Hedgehog Technical Files, Sonic was born on Christmas Island.
Sonic made his first appearance in a game in 1991. Sonic was born on day 162 of the year 3220 on the Planet Mobius
All it says in wikipedia is the first sonic game was born on June 23, 1991
BORN (obviously)
in mobledoon no. She lives in mobotropilis (I CANT SPELL IT) she, Sonic and Manic (only in Sonic Underground) were born in mobledoon. its mobotropolis not mobotropilis