Not really from 12 months! Is far too large for my (just below average height) 17 month old... I was hoping he could wear it anyway with a bit of cloth dangling, but it is cut so awkwardly that his legs get entangled and he kept ending up with both legs stuck in the opening of one suit leg - he found it so uncomfortable it had to come off after about 3 minutes. I used to have one of these which was a 'sack' that could be zipped up to create legs - that was great - but this one is just far to large.
Bought this for my 1 year old for the summer period. packaged really well but the item is far too big and although it has poppers to shorten the legs it was still too long. my daughter is tall for her age but this isnt suitable for any child less than 24months. This is going back.