A 52-year-old woman, her son and daughter-in-law have also tested positive to the virus.
A baby is among four new confirmed cases of coronavirus in regional NSW.
The baby's parents, a man and woman in their 20s, as well as the child's 52-year-old grandmother also tested positive to the virus.
Murrumbidgee Health Senior Environmental Health Officer Tony Burns said the group tested positive after arriving home in Wagga Wagga from Victoria.
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"They have returned from Victoria and they have isolated since," Mr Burns said.
He said health officials are confident the virus has not been passed on to anyone outside the family.
"They have had as needed groceries delivered online and they've done the right thing," he added.
The family are believed to have been to Melbourne, and had a travel permit to cross the border back into NSW," he said.
Health officials said the child's grandmother has "very mild" coronavirus symptoms. The other family members are asymptomatic.
Source: 9News https://www.9news.com.au/national/coronavirus-nsw-baby-tests-positive-to-coronavirus-in-wagga-wagga/6d5c157a-3527-469b-a10c-ff1e2367ccef