The 5-week-old infant who went missing Friday while in the care of his babysitter may be in danger, authorities said Saturday night.

Sarah Harris, the 48-year-old babysitter, claimed she went to the store with 5-week-old Tristan Cayden Douglas, but the two haven’t been seen since.

The baby’s mother said she last spoke to Harris at midday Friday.

Police said Tristan’s mother, Takisha Douglas, of Slidell, dropped him off at Harris’ house, in the 2000 block of Guerra Drive in Violet, before going to work. The mother called Harris at 12:20 p.m. to check on Tristan, at which time Harris said she was driving to a store in the 1500 block of Franklin Avenue.

After leaving work, the mother tried to call Harris again but got no answer. In the meantime, she had to return to Slidell to pick up her other children.

Upon returning to Harris’ house, she learned that Harris had never returned home earlier in the day. After searching the area and contacting the woman’s relatives, she contacted police to report her son was missing.

The babysitter was given powdered baby formula for the infant, authorities said.

Douglas has black hair and brown eyes, and is approximately two feet tall and 8 pounds, according to Louisiana State Police.

Harris is a 5-foot-7 black woman who weighs approximately 130 pounds, police said.

Harris’s vehicle was described as a black four-door 2014 Dodge Charger with Louisiana license plate YCR602.

The mother said she has known Harris for several years, but this was the first time she had left the infant with Harris to baby-sit.

Anyone with information is asked to call the St. Bernard Sheriff’s Office at (504) 271-2501 or the FBI at (504) 816-3000.