7 year old girl ate 400 mg of ibuprofen .
Don't worry, observe for symptoms
Thanks for asking on this platform
I have gone through the query and do understand your concern.
The usual dose of ibuprofen is 10 mg/kg/dose and maximum 40 mg/kg/day.
The toxic dose is very high that is more than 100 mg/kg.
I don't get overly worried if the child is otherwise active as the toxic dose is very high. Give plenty of fluid for early clearance through the kidney.
Although chances are less still I would request you to observe for any abnormal symptoms like stomach upset, Nausea, vomiting, rashes, irritability etc and if you notice any please consult your paediatrician.
I hope this helps.
Please let me know if you have any more questions.