If your child has a baby:
If you're claiming tax credits for a child under the age of 16 who becomes a parent, you can claim tax credits for your child and the new baby - as long as the baby lives with you. If your child is over 16 and has a baby, they can claim Child Tax Credit themselves.
Check who can claim tax credits if your child has a baby
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Según Wikipedia, UK es el país de Europa con mayor tasa de embarazos entre adolescentes, nada menos que un 2% de las mujeres embarazadas son menores de edad.