viour between children can be considered harmful if one of the children is much older, particularly if there is more than two years’ difference or if one of the children is pre-pubescent and the other is not. However, a younger child can abuse an older child, particularly if they have power over them, for example, if the older child is disabled or smaller in stature. Confidential specialist support and advice on HSB is available from the specialist sexual violence sector and sources are listed in Annex B. 461. It is effective safeguarding practice for the designated safeguarding lead (and their deputies) to have a good understanding of HSB. This could form part of their safeguarding training. This will aid in planning preventative education, implementing preventative measures, drafting and implementing an effective child protection policy and incorporating the approach to sexual violence and sexual harassment into the whole school or college approach to safeguarding. 462. HSB can, in some cases, progress on a continuum.143 Addressing inappropriate behaviour can be an important intervention that helps prevent problematic, abusive and/or violent behaviour in the future. Children displaying HSB have often experienced their own abuse and trauma.144 It is important that they are offered appropriate support. Preventing abuse 463. Effective safeguarding practice is demonstrated when schools and colleges are clear, in advance, about what local processes are in place and what support can be accessed when sexual violence or sexual harassment has occurred. It is important to prepare for this in advance and review this information on a regular basis to ensure it is up to date. As such: • if required, the designated safeguarding lead (or a deputy) should discuss the local response t