A Sydney Fortnite gamer who inadvertently livestreamed himself slapping his pregnant partner has been sentenced, avoiding being sent to jail.

Luke James Munday, 27, was sentenced to a 14-month community corrections order at Picton Local Court on Wednesday morning.

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His lawyer told the court the assault was "just a slap" - remarks for which he was rebuked by magistrate Mark Douglass.

Munday pleaded guilty in September to assaulting his partner while live-streaming a Fortnite game after she had asked him to come to dinner in their Oran Park home in December 2018.

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Douglass said he considered sending Munday to jail and he may have been handed a custodial sentence were it not for the submissions made on his behalf.

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- with AAP