Babies should have less than 1g of salt up to 1 year (0.4g sodium)
from food standards agency:
The daily recommended maximum for children depends on their age:
?1 to 3 years ? 2g salt a day (0.8g sodium)
?4 to 6 years ? 3g salt a day (1.2g sodium)
?7 to 10 years ? 5g salt a day (2g sodium)
?11 and over ? 6g salt a day (2.4g sodium
I dont think there is a level for sugar but the above site does give this info:
Nutrition panel
Look for the 'Carbohydrates (of which sugars)' figure in the nutrition information panel. The panel is usually found on the back of food packs.
High is more than 15g sugars per 100g
Low is 5g sugars or less per 100g
If the amount of sugars per 100g is in between these figures, then that is a medium level of sugars
Remember that the amount you eat of a particular food affects the overall amount of sugars you will get from it.
The sugars figure in a nutrition panel is the amount of total sugars in the food. It includes sugars from fruit and milk as well as the sugars that have been added to the food.
So a product containing lots of fruit or milk will be a healthier choice than one that contains lots of added sugars, even if the two products contain similar amounts of total sugars. You can tell if the food contains lots of added sugars by checking the ingredients list (see below).
Sometimes you will only see a figure for 'Carbohydrates', and not for 'Carbohydrates (of which sugars)'. The 'Carbohydrates' figure will also include starchy carbohydrates so you can?t use it to work out if a food contains a high, medium or low amount of sugars. But you can still check the ingredients list to get a feel for whether the food is high in added sugars