finally got 5 mins to answer.
i’m not going to go into skateboard types here, suffice to say that your modern ‘street’ double kick board is pretty specific in its use and with little rock hard wheels ain’t the thing if all you want to do is cruise around.
but if its skatepark/street skating…
firstly those little tiny boards are rubbish both in terms of size and componentry. as, componentwise, is a 6.99 complete from sports direct. but if you want a disposable complete to see if you/your kid takes to skating they are worth trying. you can always use them to move furniture in the future – seriuosly, skateboards are brilliant for hefting heavy stuff around a house!
a little kid can skate said full size board, generally about 32″ long, anything from 7-8.75″ wide and a wheelbase around 14.5″. but its not ideal, you would’nt put a 4ft6 kid on a 19″ frame 26″ wheel bike – well, halfords might (he’ll grow into it!), because their stance will be all stretched and when they begin to try an ollie the boards too long.
darkstar skateboards did a chart thats pretty helpful…
Mid 7.3″ x 29″
Height 4’5″ to 5’2″
Shoe Size 6 -7 UK
Age 9 to 12
Mid 7″ x 28″
Height 3’5″ to 4’4″
Shoe Size 4 -6 UK
Age 6 to 8
Mid 6.5″ x 27″
Height Under 3’4″
Shoe Size 5 UK or Under
Age 3 or Under
boardwise you have a few choices. there are some decent kids completes, look for darkstar ‘first push series’, flip ‘young one’ and i believe world industries do some as well.
or you can build up from separates, if you shop about you can get some good deals. my boys board (flip creepyard, indy 129 low and 52mm bones og cost about 70-80quid.
again look for flip young one series decks, termite decks (kid specific company), element twig, pretty sure creature do a kid deck… and theres no doubt more.
finally… please insist on elbow/knee pads, a helmet (most important) and maybe wristguards. for pads TSG do a junior set for around 30quid that are really good quality.