yes the correct dose is 15-10mg per body Kg.
example,
this is what book says.......
By mouth, 0.5–1 g every 4–6 hours to a max. of 4 g daily;
child 2 months 60 mg for fever after vaccines, repeated once after 6 hours if necessary;
3 months–1 year 60–120 mg,
1–5 years 120–250 mg,
6–12...