A survey of 200 parents by Public Health England found that between the cereals, juices, and pastries, kids get more than 11 grams of sugar at breakfast alone.
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That's the equivalent of 3 sugar cubes.
And over a year, that's 1,000 sugar cubes, just in the morning.
Officials are encouraging parents to use the Be Food Smart app that reveals the sugar content of food and beverages.
Around a quarter of five-year-olds have tooth decay and nearly a fifth of children are already obese by the time they leave elementary school.
Sugar is the prime culprit with the National Diet and Nutrition Survey showing four- to 10-year-olds consuming twice as much sugar as they should be.
How much sugar should children eat?
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* Age 2 - less than 13 grams or 3 cubes per day
* Age 3 - less than 15 grams or 4 cubes per day
* Age 4 to 6 - less than 19 grams or 5 cubes per day
* Age 7 to 10 years - less than 24 grams or 6 cubes per day
A small bowl of sugary breakfast cereal contains around two cubes of sugar, spreading chocolate spread on toast racks up three sugar cubes and a glass of fruit juice has a whopping five cubes in it.
The survey also showed that 84% of parents thought they were giving their children a healthy start to the day.