An airport employee found the child January 14 abandoned in a restroom near the rental vehicle counters.
But now, new details have emerged after police released surveillance footage showing a woman who is believed to be the abandoned child's mother.
A custodian told police she saw the woman holding the baby inside the restroom and that there were pools of blood on the floor.
Another Avis employee called 911, saying: "Somebody left a newborn baby with a note in the bathroom". Please get me to the authorities so they can find me a good home.
The note left with the tyke read, "Please help me".
The note concluded: "I just want what is best for him and it is not me". The infant has now been handed over to the Arizona Department of Child Safety, the Washington Post quoted the airport police as saying.
Uber agrees to Pay Waymo $245 Million in Settlement
But if driverless cars are its only road to profitability, it needs to be a technology leader, not a laggard. He founded his own startup, Otto, which Uber bought a few months later for $680 million.
Reuters Publishes Story Of Myanmar Massacre That Got 2 Journalists Arrested
According to the Associated Press, Berset said the return of Rohingya Muslims who have fled violence in Myanmar must be voluntary. The new Reuters story, in its graphic, disturbing content, is in line with the previous accounts of atrocities in Rakhine state.
Tottenham boss Pochettino unsure if Arsenal had a good window
Ian Wright has suggested in The Sun how Arsenal can get the better of Tottenham Hotspur in the North London derby this weekend . Defender Danny Rose and midfielder Harry Winks are also fit, boosting the manager's options.
Authorities aren't actively looking for the woman, but say they would certainly like to speak to her about the circumstances that led to her abandoning the child. The baby was naked with its eyes closed, Quintana said, but the woman said the baby was three months old and left in a hurried manner.
Arizona is a "safe haven" state, meaning parents can drop off newborns at designated locations like hospitals and churches if they are unable to care for them.
Ms Quintana also found the bloodied clothes in the bathroom rubbish bin.
The youngster was in great condition, authorities said.
The note then switches to what appears to be a plea and apology from the mother. The mother may still face criminal charges, given that the airport is not a designated location. Airport officials are trying to identify the mother, "but we've exhausted our resources", Butler said in a statement. "There is a lot of fear", said Kimberly Marshall, a nurse practitioner and co-founder of the Arizona Safe Baby Haven Foundation.