The cost of bringing up children increases as they get older. Try talking to your child's other parent to see whether you can agree an increase in the level of maintenance that is being paid. If you cannot agree and the level of maintenance being paid has been set according to a CSA agreement (see If you have children), then you should speak to a solicitor to see whether it would be possible for you to ask the court to increase the amount being provided. There are only limited circumstances where this would be possible (see If you have children - when to use a court).
You will need to plan financially for the time when any maintenance you receive for the children will end. For example you should plan ways in which you can attempt to maximise your income (see Managing money – maximising your income).
It is also possible for children to make a claim personally against a parent, for example to contribute to University fees or expenses.