Along with 2,000 other women in Britain and approximately 450,000 women across the world, Samantha Cameron gave birth to a child today. The baby is a girl -- and she is lucky. Her parents are lavishly well-off members of the political ruling class in one of the richest nations in the world, with a combined yearly salary that puts them well into the top 1 per cent of earners. Mum and Dad own a property empire worth millions, and hold the keys to No 10.

Little Miss Cameron will spend her earliest years in the media spotlight, but she can at least count on an excellent education at a top state primary school, such as St Mary Abbots in Kensington, which her sister Nancy currently attends, alongside many privileged sons and daughters of the financial and political elite. She will have every possible attention paid to her developmental, emotional and physical needs; she will have plenty of good food, presents, holidays in the sun and lots of love and care from her parents and an army of support staff.

She will have no problem paying for university, even though, thanks to her father's government, the costs of attending are likely to be significantly higher by the time she enters. She will easily be able to finance herself through internships and work placements to buy her entry into an elite job. She will never know hunger, or hopelessness, or financial uncertainty. For the newest addition to the Cameron clan, life will be easy and comfortable. For most of the other babies born today, however, the outlook is less rosy.

On a day when his new government's approval ratings are lower than at any point since the general election, Cameron's new bundle of electoral joy may well serve to remind dillusioned Tory defectors that the Conservatives really are the party of "the family" -- especially the heterosexual, heteronormative, married, double-earning, higher-income, upper-middle-class family. Let's not forget, however, that on the day that David and Samantha Cameron welcomed their fourth child, 700 babies were born into poverty in Britain. And they are in for a tough ride.

The austerity cuts imposed by Cameron's coalition government will hit these newborns' families hard, meaning that many of them will enjoy a much lower standard of living than they could have expected under Labour. Their parents may not be able to afford to feed them a healthy, balanced diet or to give them birthday and Christmas presents. They will attend whichever local school can afford to take them, including some 200 state schools whose promised funding for badly needed building restoration has just been withdrawn by the coalition. After the signalled cuts to housing benefit come into force, many of them will grow up in cramped, unhealthy, substandard accommodation far from local amenities.

The babies born to poor families today will be less likely to achieve their potential at school, less likely to be able to afford to attend university or further education and more likely to suffer from mental health problems such as depression, anxiety and panic disorder than those born to wealthy families. Before 24 August 2012, these poorer babies will already be significantly more likely to exhibit lower levels of attainment and well-being than children from better-off families; by 2016, less able children from families such as the Camerons will have overtaken more able children from lower-income families.

In addition, the children who were born today in inner Manchester are already likely to die six years earlier than babies born to families in the Camerons' Notting Hill quarter, in London. Child poverty and inequality were not eradicated under Labour, but the austerity cuts imposed by David Cameron's government could spell disaster for the hundreds of children born today into less fortunate households -- particularly those born to single parents, over whom the axe of economic judgement is casting a long shadow.

David Cameron and his family will be celebrating the birth of their daughter today, and rightly so. If he is serious about building a society in which every child can thrive, however, the Prime Minister may want to remember those 700 babies being born into poverty in Britain in the course of the day, and ask himself how his policymaking will affect their future. Cameron the family man has a duty to protect every child in Britain, not just those who, like his new baby girl, are fortunate enough to be born to wealthy couples.