It was "very hard" to pin down what exactly the social services had against the mother, he said.
The social worker had been asked to identify her best example of the mother failing to meet the boys emotional needs, to which she cited that she had not given him ice cream.
"Her response was that until prompted by the local authority mother had not spent sufficient one-to-one time with [the boy] and had failed on one occasion to take him out for an ice cream," said the judge.
"This struck me as utterly insubstantial criticism."
He added: "A further criticism in this vein was that the mother had failed to arrange for [his] hair to be cut in the way that he liked. Again, this is obviously inconsequential."