I share with them about who can and cannot touch and see their private parts, and that only they themselves can touch their private parts only when washing/bathing, not to touch other people's private parts, also if they are touched, to tell me who did it, by the age of 2-3. By the age 4-5 my nephew (also 4-5 yo) touched one of my daughter's private parts, and she immediately told me and my husband. So we talked to them both that it's wrong (my daughters obviously know it's wrong, the nephew's parents somehow did not teach their child about it 😅). It happened quite frequently and I got tired of it, so asked husband to tell his brother (nephew's parents) to teach their children about basic human decency. Bukan alasan "dia masih kecil, saja pegang bukan ada niat apa apa". Meluntur buluh perlu dari rebungnya. Dari kecil perlu dididik. Bukan biarkan dengan alasan masih kecil, nanti jadi habit