DS is 18 months. He isn't walking, though will very uncoordinatedly holding hands or objects, flings legs out, tiptoes etc.
He doesn't seem to understand much of what I say, gets very easily frustrated and makes a 'uuuuh' noise waving arms or hitting things away with no purpose with both arms at the slightest thing, ie currently because the big stacking block won't fit in the small one, they've been hit across the room and he's thrown himself on the floor hitting arms out.
He will usually calm himself down quickly but it happens very regularly.
He isn't saying any words but makes different noises and 'chatters' to himself, animals (especially) or me, will freeze up around most other people.
Since newborn he screamed if anyone else held him, hysterically for hours on end, including DH. We had a phase where he cried if strangers looked at him but this seems to have mostly passed.
He was slow to wean, and a tricky sleeper.
He was impossible to put down until the past few months, would scream none stop until picked up, still does quite often. But while he is physically very clingy, he doesn't like me to do things, anything restraining him like nappy changes, highchair straps or carseat usually causes a meltdown, and he won't (and never has) accept food or drink being fed to him, he has to hold it.
But recently he will play a slight distance from me at groups after a while sitting still if he's the one to move away, and has let a few people hold him. He is also a very happy toddler when it's just me and him and he has my complete attention, and he will hand toys to me, other children and adults he knows well. He will also point at things, and make the same frustrated noise or other sounds, and shakes his head a lot (if he doesn't want food, but also if he does want things or is playing/I'm talking to him - it doesn't seem to just mean no)
The health visitor seemed unconcerned/uninterested, does this sound like just a clingy toddler or likely something more to it?