The coroner recommended any safety plans should be developed with a child's primary caregiver.
Health and safety lawyer Hazel Armstrong says something is "not going right" with the current guidelines for schools.
A new report says the proposed changes risk increasing harm to children.
Watch the interview here.
"It feels good to know that everyone knows what you're feeling."
Prime Minister Jacinda Ardern is yet to respond to the letter.
Professor Gail Gillon said screentime, time-poor households and poverty are to blame.
