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A 1-month-old infant is among those infected with the coronavirus in Maryland, the state’s governor said Monday as he ordered the Old Line State into lockdown.

“We now have 1,413 confirmed cases of COVID-19 in our state, including our youngest case to date — a 1-month-old infant,” Maryland Gov. Larry Hogan said at a press conference.

The baby’s case marks the fourth known case of someone in the state under the age of 18 infected with the virus following infections in a 10-month-old infant, a 5-year-old girl and a teenager.

No further details were provided about the 1-month-old’s case, but Hogan previously said the three other children were not hospitalized.

Hogan issued a state-at-home order for the state Monday that bars anyone from going out for things other than essential work, to get food or necessary medical attention or “other necessary purposes.” The order will go into effect at 8 p.m.

“This is a deadly public health crisis,” Hogan said Monday. “We are no longer asking or suggesting that Marylanders stay home.”