Hi Fridayschild,
I used to run a first aid training co so hopefully I can help.
I haven't read other posts. But first aid is broken down into many acronyms. The first and most important being
D anger
R esponse
(shout for help)
A irway
B reathing
C irculation
In this situation, it seems fairly safe that you are not in danger, but always check as you approach.
The child is crying out in pain, so you have your Response, to cry you need an Airway and Breathing, so that's all 'ok', next comes circulation.
Kneel down as close to the child's level and quickly look for any obvious injuries, like bones sticking out, 'extra' bends where there shouldn't be, or bleeds. If the child is old enough, ask them where it hurts. (Be careful not to 'suggest' that the child may have a sore leg or arm, they may say yes and this can confuse.). Get the child to tell you or point to the pain. See if anyone saw it happen, therefore you can ascertain the height of fall.
Put on gloves, feel over the child (top - to - toe), looking at hands every now and again (for blood), monitor pulse.
Look for signs of shock
PALE COLD CLAMMY SKIN
RAPID SHALLOW BREATHING
RAPID WEAK PULSE
NAUSEA
In this situation, if you are unsure as to how the child has landed or how far they have fallen, I would treat as a potential fracture, I would call 999. I wouldn't advise moving the child UNLESS they become unconscious.
Under 'first aid at work' you aren't allowed to take a child to hospital yourself, you must call an ambulance.
VERY IMPORTANT, REASSURE REASSURE REASSURE the child, get a favourite teddy or toy, distract and STAY CALM or at least try and pretend!!!!
Disclaimer, since I last delivered a first aid course there have been a few protocol changes but I'm fairly sure they are just to do with CPR>