Updated: Added a link to the Universal Credit change of circumstances page.

If you, or both you and your partner are working you may be able to get support with the childcare costs you pay to a registered or approved childcare provider.

Childcare costs can only be claimed for a dependent child up to the 31 August following the child’s 16th birthday.

https://www.gov.uk/government/publications/universal-credit-and-childcare