As a 10 month old?
I just read somewhere that it isn't acceptable. Which leads me to starting this thread 
My 10 month old is a tiny little thing but walks up to other children bold as brass and snatches toys. They're always around his age but also always bigger. This has gone of for a couple of months now.
On a rare occasion that the other baby tries to take the toy back, my DS seems to push them over.
I know I shouldn't find it funny but it was funny when he tried to steal something from another baby recently and said baby stood up as if to confront him. DS's eyes went from looking down to looking well above him once the other child was standing in front of him 
But on a serious note, I tell him no and explain 'that is unkind, we do not take other people's things'. I am firm.
Surely there isn't anything to it. DS looks very 
as if he's confused. Surely he doesn't have the emotional maturity to understand that it's naughty?
He looks about 3 months old so people often mistake him for a younger child until they see him stealing and running up to things.