Hi, examples for cross infection in a setting include the potential to pass on/spread head lice, thread worm, disease & illness.
Consider the setting's policy & procedures on how & when to wash hands, store & prepare formula milk and foods, how waste is disposed of, surfaces cleaned, what protective clothing & resources are used, how toileting happens and accidents are dealt with.
If you have access to a copy there's good reading from page 288 of the
cache handbook - on amazon.co.uk
Thread looking at the principles of cross infection
Infections on NHS.uk
Cross infection and cystic fibrosis
Best wishes