I would like to know if someone under 18 years old and born in the United Kingdom can claim British citizenship. I hope you can shed some light on this for me.

Persons who are under 18 years old can register to become a British citizen if one of their parents considered the United Kingdom (UK) as their home and did any of the following after they were born:

Just to be clear, persons must have been born in the UK and be under 18 when they apply to become a British citizen.