Research covering the period of 2020/21 shows Glasgow City and North Ayrshire have the highest percentage of children in poverty across local authorities, with 29.4 per cent and 24.7 per cent respectively.
Ministers have been praised for the Scottish child payment which will be increased to £25 for all eligible under-16s by the end of the year.
However, the coalition is now urging the Scottish Government to double the bridging payments which will be paid in October and December.
It helps bridge the gap for eligible children who are waiting for the increase to the child payment to be rolled out.
The group – made up of charities such as the Child Poverty Action Group in Scotland, Save the Children and Poverty Alliance – are also urging the UK Government to ensure UK-wide benefits keep pace with inflation permanently.
Child poverty rates in the UK fell during the 2020/21 period, primarily because of the temporary Covid-19 universal credit uplift.
The research, conducted by Loughborough University on behalf of the coalition, also found that Scotland has lower levels of child poverty compared to England and Wales.
But campaigners say there can be no room for complacency if Scotland aims to meet its child poverty targets.
The Child Poverty (Scotland) Act requires the Scottish Government to ensure fewer than 18 per cent of children are living in poverty by 2023/24, on course to achieving less than 10 per cent by 2030.
Experts recently warned the Scottish Government would need “significant” and ongoing commitment to reach its 2030 target.
And the group wants action from all levels of government, with newly elected councillors urged to use local powers over housing and family support to maximise family incomes and reduce the cost pressures.
Ed Pybus, of the Child Poverty Action Group in Scotland, said: “The figures show just how big a difference investment in social security can make, and how important the Scottish Government’s new Scottish child payment is and will continue to be if Scotland is to end the scandal of children living in poverty.
“Progress is being made but, as low-income families struggling to cope with spiralling prices know all too well, there is no room for complacency, and we need every level of Government to do its best to meet Scotland’s child poverty targets.”
A Scottish Government spokesperson said: “Ahead of the (Scottish child payment) extension to under-16s, we introduced bridging payments worth £520 annually to support around 145,000 school-age children.
“We’re set to put £150 million in pockets of low-income families through this additional support in both 2021 and 2022. These payments alongside our Best Start Grants and Best Start Foods are vital forms of financial support only available to families in Scotland.”
A UK Government spokesperson said: “We recognise people are struggling with rising prices which is why we are protecting the eight million most vulnerable families with at least £1,200 of direct payments, starting this week.”