National Foundation for the Deaf New Zealand general manager Louise Carroll said a survey of 65 kindergartens, playcentres and kohanga reo found 20 per cent of children had been affected by high noise levels.
Some were stressed or distressed but about 8 per cent of children starting school had some hearing loss, she said.
EarplugStation has a great range of earmuffs for kids, babies and toddlers.
See the full range here