Ellen Broome, director of policy at the Children's Society, has told ITV Daybreak that many migrant children "are often children in need rather than immigration statistics."
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Ms Ardern posted a photo showing her and Clarke Gayford with the baby at Auckland City Hospital.
Nasa says scientists have found 95% of near-Earth objects measuring a kilometre or bigger, but the remaining 5% could inflict big damage.
There will be showers during the morning across Scotland, but these will clear during the afternoon.