There's no way to tell you for sure I'm afraid Marie

They're not a pure breed pig, instead a result of crossing different breeds (usually something small like a pot bellied pig or Kune Kune pig with a different breed - which
may be a standard sized pig) so they could stay as small as pot bellied or Kune Kune pigs OR they could get as big as a Tamworth

Without wanting to upset you, or meaning to offend you - if you're considering one as a house pet - PLEASE don't ! Have a look on pre-loved or RSPCA sites - there are lots looking for new homes because they've either outgrew their home or become a bit of a problem.
But, if you have adequate outside space for permanent pigs (you'll notice I say 'pigs' - one on it's own isn't good

), you're looking at half an acre minimum - then please do go ahead and rehome some of the hundreds that have passed the 'awwww cute' stage - if not the future for them isn't looking too bright

Oh, and don't be surprised if you start a full scale riot here on TAS

'Micros' are a subject a lot of us feel quite strongly about

Karen