Children in the UK exceed the maximum recommended sugar intake for an 18-year-old by the time they are 10, according to experts.
This is based on their total sugar consumption from the age of two, says Public Health England (PHE).
Children consume much more than they should, around eight excess sugar cubes a day or 2,800 excess cubes per year.
PHE said a pudding tax should be considered if companies fail to reduce the amount of sugar in their products.
The organisation also wants families to cut back to help tackle obesity, tooth decay and other illnesses linked to excess sugar.
Choosing lower-sugar foods and drinks can make a difference.
The recommended daily maximum of sugar for children aged four to six is five cubes or 19g. For children aged seven to 10 this rises to six cubes (24g) and up to seven cubes (30g) for those aged 11 and over.
However, UK children are consuming around 13 cubes or 52g of sugar a day, says PHE, based on results from the National Diet and Nutrition Survey.
Half of the sugar in children’s diets comes from sugary drinks, sweets, biscuits, cakes, puddings, sugary breakfast cereals and higher-sugar yoghurts and puddings.