Fledgling Swallow

Hi -

I have a baby fledgling swallow on the ground - the parents are nearby and keep swooping down to check - but, I had read somewhere that a swallow should never be on the ground and will fledge and fly immediately??

Should I be worried? Should I do anything to help it?

It looks perfectly happy hopping on the ground - but, I am unsure as to what to do - can someone please offer me any advice?

With many thanks!