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Should children come to the VFS Global visa application centre for applying for a visa?
Every applicant who is submitting a visa application must attend the visa application centre in person. Children below the age of 5 need to attend the visa application centre to provide a digital photograph, but are not required to provide their fingerprints. Children below the age of 18 need to be accompanied by an adult and this cannot be a member of VFS Global staff.
This is from the UKVI in UAE but the same applies for other places as well.
https://www.vfsglobal.co.uk/UAE/frequently_asked_questions.html