Transferring NI Credits Gained Through Child Benefit To Spouse

My online record shows all my NI contributions are based on my self employment but as child benefit was received in my name for a number of years (ending recently) I presume there are NI credits available for this which my wife (who has zero NI record) could receive. Can someone confirm how this is applied for and whether this can be done back to around 2016? Thanks.

Hi,
If you want to transfer the Child Benefit you need to complete and return form CF411A - Application form for Credits for Parents and Carers (CPC) which you can
complete through your Personal Tax Account (PTA) or you can download this form via this linkApply for National Insurance credits if you’re a parent or carer.
This can be backdated.
Thank you.