Baby Greengage Sapling (Parson's Heath CO4)

Hi folks,
I have a teeny-weeny baby Greengage tree sapling on offer. Every so often my Greengage tree has these sprouting from its fallen fruits.
It is rooted, healthy & potted.
I have put-up a photo of the adult tree, just as an indicator of the eventual size of the adult tree, maybe 15ft - 20ft tall.
My adult tree can produce about a bucket of sweet yummy greengages most years.