Hmm this is really difficult! I’ve checked some academic papers that should be around 1-1.5 kg-ish but again this is really rough and don’t worry your brain will grow as you grow too 🙂
I am not sure exactly how big is the brain when e are ten….but baby’s brain when they are born weighs about 350-400 grams and then it grows to reach a weight of about 1.3-1.4 kilograms in adults….maybe at 10 we are in between!!!
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