Well, I wasn’t going to bother responding but my reply might make others feel better.
Until the age of about 16/17 months, DS was incredibly gentle and loving. If I said no to him he’d cry. My friends children would laugh. My child listened to me, wasn’t I a great parent? Right?
All changed at around 16 months. The first time I noticed it was when a friend visited with her little girl. DS snatched toys off her whenever she picked something up, tried to push her off his rocking horse. I was mortified and I actually cried after that visit. It felt like something I had done, or caused in some way. I also noticed she was far more verbal than DS, identifying animals in books, which DS couldn’t do. That was my fault as well, I thought, and went on a spending spree in Waterstones buying educational books and endlessly pointing at the bee in That’s Not My Bee saying ‘bzzz, bzzzz.’ Silence 
Then nursery told me he’d bitten another child. Straightaway I said I am so sorry. Is the child all right? Please apologise to the parents. Nursery reassured me it was normal but it didn’t feel normal when none of the other kids I knew were doing it.
i felt I had to be seen ‘doing something’ so would intervene, grabbing toys off DS to return to another child, loudly and probably annoyingly saying ‘share!’ It didn’t work but it did get me tantrums for my pains.
Then we moved nursery (moved house) and I sat in the new room for his settling in days and I saw things from his POV. I realised that in this environment if you don’t grab, you don’t get. I realised that if I intervened it prompted a hit but if I just let them sort it themselves it was fine. Another child might have their toy taken off them but in seconds DS would put it down and then they could have it back, if they wanted it (they’d mostly moved on.)
And DS speech came on and more importantly his understanding did. Now I can say ‘it’s okay DS, she’s just looking’ or ‘it is still your toy but can he see?’
And I was getting glowing reports from nursery, he mostly seemed to have stopped mashing other kids and all was well. But yesterday I had to stop him hitting a few times. All is explained today with a high temp and being sick.
So how the hell do you discipline a 16 month old? You can’t. You can move them away and you can physically prevent them hitting but sometimes it happens.