His parents, Tom Evans and Kate James, had been at the centre of a High Court battle as they attempted to challenge a court ruling allowing Alder Hey Children's Hospital to withdraw ventilation, after doctors said continued treatment was "not in Alfie's best interests".
People put flowers onto the funeral cortege of Alfie Evans goes past Everton's Goodison Park ground in Liverpool.
People gathered outside Everton's Goodison Park stadium as the procession passed following a private funeral service.
One woman told the Liverpool Echo she had come because "I want Kate and Tom to know I care", while another said she was "so proud" of Alfie's parents.
The parents had fought to take their son, who had a degenerative condition that caused irreversible brain damage, to a clinic in Rome but lost in court.
In February, a High Court judge ruled that doctors could stop providing life support for Alfie, against his parents' wishes, saying the child required "peace, quiet and privacy".
Alfie had a degenerative neurological condition that left him with nearly no brain function. Inside a hearse, Alfie's coffin was decorated with images of toy soldiers and the Everton logo.
Judges in the High Court, the Court of Appeal and the Supreme Court agreed with doctors and rejected a series of legal challenges by his parents to take him overseas.
British law states that parents "cannot demand a particular treatment to be continued where the burdens of the treatment clearly outweigh the benefits for the child".
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