News of the baby's ordeal was met with horror and pity by bloggers on Chinese sites. Most speculated that the child had been dumped by his parents down the toilet. The rescue prompted an outpouring from strangers who came to the hospital with diapers, baby clothes, powdered milk and offers to adopt him.
Dushikuaibao said the mother was present throughout the entire rescue and expressed her concern for the child, though that didn't immediately rouse suspicion of the police.
Police initially said they were treating the case as possible attempted homicide, but it was not clear whether the mother would face criminal charges.
Local police refused to comment, saying the case is under further investigation.
In China, unwanted pregnancies have been on the rise because of a lack of sex education and an increasingly lax attitude toward sex. Young men and women often engage in unprotected sex, and abortions have become increasingly common, with abortion services widely available.
Sociologist Li Yinhe said more than 70 percent of China's young adults have had premarital sex, but that Chinese schools typically shy away from sex education and teaching about contraception because teachers don't want to appear to condone sex before marriage.
"The public also is very ambiguous over whether you are committing a murder when you kill an infant or abandon it," Li said.
The landlord of the building told local media earlier in the week that there were no signs that the birth took place in the restroom and she had not been aware of any recent pregnancies among her tenants.
The baby's mother told police she cleaned up the toilet after the delivery and had managed to hide her pregnancy by wearing loose clothes and tightly wrapping her abdomen, Zhezhong News said.