Instead of worrying about it, there's plenty of places they can go for advice.
The BBC have a pre-teen and teenage-friendly puberty section: Visit the BBC's website
Family planning experts Marie Stopes also have a site aimed at girls and boys reaching puberty: Visit likeitis.org.uk
The NHS website also has more factual information on puberty and the possible problems that come with it: Visit NHS Choices website
More help for mums from goodtoknow- Talking to your child about puberty and sex
- One mum's story: 'I used Coronation Street to help with sex education'
- One mum's story: 'Their hormones are starting to kick in'
Where to next?- More advice for parents of teenagers
- More help with pre-teens
- 10 dos for parents: Talking to your teen