Everyday products such as shampoo and dishwashing powder are putting dozens of toddlers in hospital every year.
A new report on hazardous substances shows that injury rates for youngsters are three times higher than other age groups.
In 2014, the most recent year analysed, there were 70 children aged under 5 who were hospitalised as a result of hazardous substances.
Environment Minister Nick Smith said hospitalisation rates for under-5s had dropped by 30 per cent since data collection started in 2006, to 23 per 100,000.
"There are still too many people ... being injured," Smith said.