'Puberty is a time of big changes inside and outside your child’s body. It helps to know about the major physical changes in puberty that you can expect for girls and boys, and when these changes happen.'
Raising Children also provides information and helpful tips for parents and carers regarding talking to your child/teenager about puberty.
Below is a fun and casual video about puberty aimed at boys aged 9-15.
And here is the girl's version.