"Water is Best" is the message the Whanganui District Health Board wants to be spread throughout its children's and maternity wards at the hospital.
It wants patients, family members, visitors and ward staff to all say no to sugary drinks and choose water at hospital, and at home.
"We know parents like to bring treats in for their children but when those treats include sugary drinks, we want to raise awareness about the damage that sugary drinks can do to their child's teeth and long-term health," said the DHB's Oral Health project manager, Felicity Spencer.
Drinks often considered "healthy", said Spencer, contained large amounts of sugar.
"A glass of juice contains about 6.5 teaspoons of sugar, and a bottle of sports drink about 14 teaspoons.