Dr Hilary Cass says she is "absolutely convinced that more children will be harmed if we don't do the trial than if we do."
Entries by BBC News
Hot weather during the summer can affect anyone, but some people run a greater risk of serious harm.
Some UV exposure is essential for our wellbeing, but too much is damaging and can cause skin cancer.
Know the signs and what to do if someone is unwell in hot weather.
From the autumn a new Water Safety Forum is being introduced to primary and secondary schools.
From the autumn a new Water Safety Forum is being introduced to primary and secondary schools.
How the rise in night-time temperatures is starting to disrupt our sleep and health
One in five men dies before the age of 65 but getting help sooner could save lives.
One in five men dies before the age of 65 but getting help sooner could save lives.
The presenter shared his "aggressive" cancer diagnosis on an episode of Clarkson's Farm earlier this week.