Obligatory not a doctor, but I don't think you gave enough to have a massive effect! Don't stress yet, call your pediatrician and ask for more security but I think you'll be okay 🙂
There's a useful chart here that recommends dosage by weight rather than age and for 9kg it recommends 4ml anyway so 5ml probably hasn't done any harm 😊 https://www.healthychildren.org/English/safety-prevention/at-home/medication-safety/Pages/Ibuprofen-for-Fever-and-Pain.aspx
Call 111
I did the same at 1 years old and was told by 111 to keep an eye on her but she should be fine as they do that amount in hospital x
Thank you all! I did call 111 and they said she will be fine, that it won’t have a big impact. Just to skip the next dose which I was going to do anyway but thank you all, really reassured me. I am so tired and sleep deprived that I wanted my daughter to sleep well with no pain and I gave her the dose thinking it was the same as paracetamol, but all is good now ☺️
Call 111 and ask advice