Ans. None (1100 calories/day) In general, if you want to know how many calories (per day) a child needs, a good rule of thumb for children up to 5 years of age is to begin with a base of 1,000 calories and add 100 calories for each year of your child's age. 1 year-old would need approximately 1000 + 100 calories for 1 year, or 1100 calories/day. A 2 year-old would need 1000 + 200 calories for 2 years, or 1200 calories/ day.