Typing your child's medical problem into Google is unlikely to deliver much in the way of good advice, UK researchers have said.
The Nottingham-based team used the search engine to find UK-based advice on five common issues, including breastfeeding and autism.
Only about 200 of 500 sites offered correct information, Archives of Disease in Childhood reports.
Government-run sites were the only completely reliable source, they found.
It is now estimated that 70% of UK households have access to the internet, and increasingly, parents are turning to search engines for a second opinion - or even a sole one - on medical matters.
Many doctors, however, are concerned that the huge quantity of information and advice is at best unreliable, and in some cases misleading or even dangerous.