Deng Ying, director of the Beijing CDC, told China Daily no pregnant women in the capital had to date received the A/H1N1 flu vaccination, which has been free and voluntary.

A Beijing-based would-be mother surnamed Liu, 31, who is expecting her baby in a month, said: "I've heard that no vaccine is risk free, so I have not gotten the jab for fear of potential side effects and harm to both me and the baby."

In Hong Kong, two women had reportedly suffered stillbirths and another four suffered spontaneous abortions after receiving the A/H1N1 vaccination in late December.

Local health authorities said they have found no link so far between the incidents and the vaccine.

That has further dampened Hong Kong people's enthusiasm toward the vaccination, said director of the Center for Health Protection, Thomas Tsang Ho-fai.

The "underwhelming" response to the vaccine might leave Hong Kong with plenty of unused doses, he said.

More than 68 million people on the mainland received the jab as of Monday.