This is very hard- and it does totally lack in compassion, and it would be inhumane to fly the child back.
And yet, DH is British and has contributed for the whole of his career, both in taxes and with very hard work and long hours dedicated to the NHS. I am British since 1972- and also contributed all my adult life, both in taxes and as a teacher in the State system. And yet, now we live abroad, despite having a flat and an address in the UK, we are no longer entitled to use the NHS in any way shape or form. There must be 100s of 1000s of relatives of British citizens who live abroad who are not entitled to NHS treatment, despite being desperately in need. So where does the Gvt draw the line- anyone who flies here and gets here gets treatment, whatever the cost? I know there would be an uproar if that happened, and open the flood gates- especially at the time of heavy cuts and privatisation, etc.