Gerber apple juice to Motts apple juice?

My som just turned 1 about 2 weeks ago and I'm still giving him Gerber apple juice, the same juice the same kind he's been getting since about 6mos. The good thing about it is there's only about 60 calories in the whole container and only about 13g of sugar but it goes soo fast! But how long it lasts really isn't a problem I just was wondering when did u begin ur kid on Motts juice?