Nearly one in five children from London now live in low income households.
According to figures released by the Department for Work and Pensions, 19% of children living in the area were in households classified as being in the absolute low-income category.
This figure is an average for the three-year period ending 2013-14.
The figure for this period is an increase of one percentage point compared to the figure for the three years ending 2012-13 and means that around 300,000 children from London are now considered to be in low income households.
To qualify as an absolute low income household, the earnings of that household must not be more than 60% of the average income in the area.
Across the whole of the UK, the number of children in low income households in the three years ending 2013-14 was 19% - the same figure as in the period ending 2012-13, but one percentage point higher than in the two three-year periods prior to that.
The increase from 18% to 19%, between 2011-12 and 2012-13, was the first time that the proportion of children in low income households increased in the past 20 years.
Not only has this proportion failed to come back down in the three years ending 2013-14, but the number of children living in low income households has actually increased for the second successive year.
In 2012-13, there were 2.5m children in low income households and this rose to 2.6m in the latest period.
The situation is even more stark when factoring in the rising costs of rent, mortgage payments and utilities.
In the three years ending 2013-14, as many as four million children were considered to be in absolute low-income households after these costs were counted, compared to 3.7m in the three years ending 2012-13.
The Child Poverty Act 2010 sets the government a target of reducing the proportion of children in absolute low income households to just 5% by 2020-21. Based on current figures there is little hope of achieving this goal.