Is a 12 week old baby supposed to do these things? I don't know any other babies and my mum seems to think he's doing things older for his age. But I haven't a clue as I've never seen another 
He smiles if you smile at him, my mum thought babies couldn't usually wouldn't do this until they're older?
He proper giggles if you play with him and seems to recognise my mum in particularly
He pulls things to his mouth
And he plays with his toys, if you give him one he'll touch it and look at it and smile and laugh
Like I said I thought this was normal but my mum thought babies around 4-5 months would do it not a slightly under 3 month old?