I had a two year old like this.
He is my second child, now a middle child.
Exhausting, busy, impulsive, with no in-built risk assessment. I was constantly running after him because actually he did things that put himself at serious risk of death or serious injury in ways I would have never imagined with my first child.
I pushed my fears and concerns about this to the back of my mind, supported by the comments made by others "Second children are like this!" "He sounds healthy and happy" "He just needs to find a sport!".
By 5, he started school. He remained extremely active and busy, he remained incredibly impulsive and couldn't seem to stop his first instinct even if it meant injuring himself, getting excluded from any turn taking activity, breaking something he cared about (and being filled with heart breaking remorse later). He couldn't sit still to learn anything at school -not even the alphabet. He was excluded from going out at playtime as the school couldn't manage the risks associated with his impulsivity.
At 6 he was diagnosed with ADHD. He has the severe combined type (hyperactivity, impulsivity as well as the usual inattentiveness).
Within 6 months of starting treatment, he has learned to read and write and is an entirely different child. School was going well pre-lockdown. He is forming friendships. He has a few hobbies and activities. He's been able to start Beavers. These simple things seemed out of reach just a short time ago.
He hates being without medication (first thing in the morning and when it wears off in the evening). He feels like him when his meds are on board. Otherwise he says his head is too busy, he can't keep up, he can't think, he feels confused and like his "energy" might take over, he feels "out of control". He talks about what life was like before medication with sadness; I hadn't realised that he was unhappy or finding things difficult.
I happen to be a Psychiatrist but I'll just say, I don't think you can diagnose this over the internet, and I'm not doing that. It's just that when you do have a child with ADHD or possible ADHD, you'll hear 999 voices telling you they are "fine", "healthy" "just boisterous" etc etc and maybe only 1 saying, you know this might be difficult because of something like ADHD. So I suppose I wanted to add that balance.
1 in 30 kids has ADHD, it is not rare. It is a real neuropsychiatric condition with as much biological and clinical evidence as epilepsy.
Medication works really well when the diagnosis is robust.
Living with untreated ADHD is really tough and associated with poor outcomes in life.