He's got little hands - hands of a 10 year old. Bats different as they get categorised into relative sizes linked to height but gloves come in small boy size and thats about it. Id love to take him to a shop to try a few pairs on and get a great fit - but the local stores only stock 1 pair in each for small boys wicket keeping gloves - and they're big multi chain retailers too. He's got small hands and he's 10 is about the best I can offer. Getting a pair that has been tried and fitted would be ideal but thats not likely - you've obviously not bought kit for a small child Vitas ! Its not as easy as buying for say a boy or a youth or in adult sizes. Bats easier at that age, batting gloves and pads tricky enough, wicket keeping gloves more difficult.
I would argue bats are more difficult. The height charts are a great guide and starting point but i size up each child based on a number of factors. Where on he handle they grip it, their stance, the length of their arms and legs, as well as their overall height.
Gloves are easier, i look at their hands, and we try some on. They fit or they don't.
All of the above is far easier done in person of course, doing it remotely is tough.
A few brands we stock go down as small as extra small boys for their wk kit, I cannot recall the brand (I think gray Nics) but we have ordered a cool little set for the young/small keeper. Gloves, inners and pads all in one box, XS boys, S boys and boys size from Memory.
Feel free to give me a call or email to discuss
Ps yes you are correct, I don't have any kids