Authorities have ordered all production stopped at Changsheng and a massive vaccine recall.
Another man from Guangdong in southern China, who gave his surname Chan said he had brought his one-year-old son to a private clinic in the same area for the PCV13 inoculation after making an appointment two months ago.
China's censorship regime is in full swing after another domestic vaccine scandal caused an uproar-particularly as details have emerged of an apparent coverup by the Chinese pharmaceutical company involved and an egregious oversight by the Chinese authorities.
"Not just the culprits directly responsible for the problematic vaccines, but also those responsible for enabling the sector's misdeeds need to be caught", it added.
China is hit regularly by quality-control scandals, fuelling fear over the safety of food and medicines and anger at regulatory lapses.
According to the China Food and Drug Administration, Changsheng fabricated production records as well as product inspection records, and arbitrarily changed process parameters and equipment, in "serious violations" of the law.
Premier Li Keqiang said in a statement Sunday that Changchun Changsheng Life Sciences Ltd., which is accused of fabricating production and inspection records, "violated a moral bottom line".
In October, the same company was ordered to stop producing a DPT, or diphtheria-pertussis-tetanus, vaccine after batch was found to be defective.
The topic page on twitter-like Weibo with the hashtag "Changsheng vaccine case" has been viewed over 680 million times on Monday.
Anxious parents trying to ascertain if their children had been administered faulty vaccines led to the topic becoming the second most watched at the weekend on the Weibo social media site, with details widely shared on the WeChat messaging app. However, the administration's findings came a little too late, as most of the faulty doses-about 252,600-had already been sold and shipped to the Shandong Province disease control and prevention center in eastern China.
Changsheng's Shenzhen-listed shares plunged by their daily limit of 10 percent on Tuesday, extending falls that have seen it lose US$1.8 billion (1.4 billion pounds) or more than half their value since mid-July.
Changsheng is now being investigated by multiple authorities in China, including the securities regulator and the country's top graft watchdog. They have slumped 47 percent since mid-July.
Authorities in Hebei announced on Monday that almost 150,000 people in the northern province received a sub-standard diphtheria, tetanus and pertussis vaccine made by another firm, Wuhan Institute of Biological Products.
Last week European regulators found that a common blood pressure and heart drug manufactured in bulk by Chinese firm Zhejiang Huahai Pharmaceutical may have contained an impurity linked to cancer since 2012.
In 2016, Chinese police busted a gang for selling around $90 million worth of illegal vaccines on the black market.
Some parents in the province of Guandong said they had lost confidence in vaccines made in China and that in the future they would like to have their children vaccinated in Hong Kong and Macao.