Image copyright Reuters/China News

Speculation is mounting in China that the country is set to further relax its two-child policy and allow people to have more children.

Postage stamps unveiled earlier this week to mark the incoming Year of the Pig in February 2019 have led many social media users to question whether a loosening of family planning restrictions could be imminent.

The stamps show a parent pig couple and three piglets. On the surface, it hardly appears to be a policy announcement. But users on the popular Sina Weibo microblog have pointed out that two years ago, before the one-child policy was abolished, China issued Year of the Monkey stamps featuring two baby monkeys.

And in recent months, the Chinese government has been strongly encouraging couples to have more than one child. Local authorities have even been offering incentives, such as tax breaks, and education and housing subsidies.

State media have also been suggesting that change is on the horizon.

The China Times newspaper said in a recent editorial that the two-child policy is "not effectively increasing the national fertility rate".

The controversial one-child policy was first introduced in 1979 and finally abolished in late 2015. But parents have been slow to take advantage of the two-child policy that replaced it and many young Chinese say that they would struggle to afford having one child - let alone two or more.

Image copyright China News Service Image caption The Year of the Pig stamps have a 'happy family' theme

According to the China Daily newspaper, the stamps for the new year are "the fourth cycle of zodiac stamps with the theme 'happy family'."

One depicts a pig "running towards a better life", while another shows "a five-member pig family living happily".

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Chinese New Year, which falls annually in either January or February, is traditionally seen as a sign of new beginnings. The state often highlights certain themes and ideas ahead of upcoming policy changes in the new Lunar year.

Consequently, social media users, in their thousands, have been suggesting that the stamps are a subtle signal from the government.

Image copyright Visual China Group/Getty Images Image caption When the one-child policy was abolished, China printed stamps depicting a mother and two baby monkeys

Weibo user 'Shandong Mage' noted that the 1980 stamp featured a single monkey, but that the 2016 stamp featured a mother and two baby monkeys, and was released shortly before the one-child policy was scrapped.

China introduced its one-child policy in late 1979 to reduce the country's birth rate, although it had already decreased significantly from 5.8 children per woman in 1970 to 2.7 in 1978.

'Sven_shi' shared a picture of the new stamp featuring the pig family, saying: "I hope everyone can understand… this is not only to encourage people to have a second child, but to have three children."

He said that some 25 million people came out of the labour market every year and became people "who need social security support".

His post, which has been shared over 1,000 times, alludes to the challenge posed by China's ageing society. By 2050, more than a quarter of its 1.3bn population is expected to be over 65 years old.

The country's fertility rate is one of the lowest in the world and well below the rate of 2.1 children per woman required to replace the population across generations.

China also faces a worsening gender balance, a hangover from the one-child policy, when the country's traditional bias towards male children led to forced abortions and female infanticide. It's estimated that there are some 33 million more men than women currently in China.

Image copyright China News Service Image caption One of the designers of the stamps shows off his work

But the government's efforts to get people to have more children have not gone down well with many young people.

The new stamps have prompted a flood of messages on Weibo from users who say they can't afford to have more than one child.

'Poor and exhausted'

'Chen Tangjie' says that he, or she, is "young and struggling" to stay afloat. "I can't afford three children, a three-child policy is not necessary!" adds 'Chun Jierun'.

'Shanshan Doudou Xiatian' says: "The conditions are not good for more children; the economy and people's energy are already exhausted."

Some users say there are problems with the education system that need rectifying before parents are encouraged to have more children.

One says that China should be "reducing the huge burden on people in the education industry and creating more nurseries" instead of "encouraging people to live like pigs".

Others say that a three-child policy would specifically impact women's careers, and cite problems getting onto the housing ladder because of rising property prices.

'Tricats' says: "I can't afford a big house; a big house is not necessary... I can't afford a child, so a child is not necessary."

"Nowadays, it's become obvious that recruiters are avoiding hiring women who have not yet had children," says 'Quliulang Kehao'.

Media playback is unsupported on your device Media caption Why China's two-child policy still doesn't go far enough for some families.

It's entirely possible that the stamps are not designed to signal a new three-child policy. In 2007, the last Year of the Pig, stamps were released showing a family with five piglets.

But many believe China could actually go much further. Scholar He Yanfu told the China Times that there was "a 90% chance that a fully liberalised birth policy will be implemented next year".

BBC Monitoring reports and analyses news from TV, radio, web and print media around the world. You can follow BBC Monitoring on Twitterand Facebook.