Hi your setting will have a policy and set of procedures that staff must follow in order to protect the child, acknowledge and respect the rights of the family.
3.5 explain strategies that support children and parents or carers in situations where harm or abuse are suspected or alleged
Consider if any of these seem familiar
Have a place where confidential information can be shared appropriately in privacy.
Ensure the child's key person is involved as they will have the closest relationship with child and family.
Be able to explain the setting's child protection policy, the concerns that have been raised and the process which will happen calmly, without judgement or bias.
What else does your setting's policy say?
https://www.silkysteps.com/forum/showthread.php?t=15156
Hope this helps a little