While parents may find it awkward to talk to their kids about puberty, it is a conversation that should begin early. Since puberty in girls starts between the ages 8-14, talk to them about menstruation, before they experience it and are frightened off by the sight of their first period blood. Also, if your daughter is concerned about their breast changes, let them know it's normal and comfort them simultaneously.
Puberty in the body begins at age 9 to 15. While they may find it hard to open up about their concerns, initiate the talk. Start off with the basics and as and when you feel the time is right, educate them about sex and the protection they need against sexually transmitted diseases and infections.