Missouri Gov. Jay Nixon gave the order Saturday to send Guard members to Kansas City to assist in the search for 11-month-old Lisa Irwin, ABC News reported.
Lisa Irwin was last seen Oct. 3, when her mother, Deborah Bradley, put her down for the night.
Her father, Jeremy Irwin, said he returned home from work to find the 11-month-old's crib empty, the front door unlocked and a window broken in.
The team of National Guard members and Kansas City police combed through open and wooded areas near the Irwin family home where Lisa Irwin was last seen, The Kansas City (Mo.) Star reported.
Kansas City police searched an abandoned house Saturday night on a tip in the disappearance of the baby, but Capt. Steve Young said it is unlikely the used diapers and a child's backpack found at the scene are connected to the baby's disappearance, the newspaper said.
"It just doesn't fit," Young said.
Young said the tip came from volunteers searching for the child, but the diapers appeared to be in the house for some time, outside the time frame of Lisa's disappearance.
Police also took a homeless man seen in the area into custody for questioning Saturday night.
"Of course we want to talk to him, but no more or less than any of the neighbors" in the area where the baby was last seen, Young said. "He is not a suspect."