The daily recommended maximum amount of salt children should eat depends on their age: 1  1 to 3 years – 2g of salt a day (0.8g sodium) 2  4 to 6 years – 3g of salt a day (1.2g sodium) 3  7 to 10 years – 5g of salt a day (2g sodium)  11 years and over – 6g of salt a day (2.4g sodium)