NSPCC Cymru has revealed there has been 200 referrals to local agencies over fears of sexual abuse in Wales in the past year.
This is a 28% increase on the previous year.
The charity estimates that one in 20 children have experienced sexual abuse.
NSPCC Cymru says children who have experienced sexual abuse may:
avoid being alone with people, such as family members or friends
show sexual behaviour that's inappropriate for their age
have physical symptoms such as a sexually transmitted infection