What is the process for Aadhaar enrolment for children of NRIs above 5 years and below 18 years of age?

An NRI child seeking enrolment to visit an Aadhar enrolment centre along with Mother and/or Father or Legal guardian and submit a request in requisite enrolment form alongwith valid supporting documents. Enrolment and Update form can also be downloaded from https://uidai.gov.in/en/my-aadhaar/downloads/enrolment-and-update-forms.html

The enrolment operator shall capture the following informations during the course of enrolment:
Mandatory Demographic information (Name, Date of Birth, Gender, Address and email)
Optional demographic information (mobile number )
Details (Aadhaar number) of Mother and/or Father or Legal Guardian (in case of HOF based enrolment) is captured . Both or One of the parents/ guardian has to authenticate on behalf of the child and also give consent for enrolment of the minor by signing the enrolment form.
And
Biometric Information (Photo of child)
Type of documents presented [valid Indian passport of the child is mandatory as Proof of Identity (PoI)]
Residential Status ( Resided in India for at least 182 days is not applicable for NRI)
After completing the enrolment the operator shall return all the documents alongwith an acknowledgement slip containing the applicable charges (New Enrolment is Free of charge).
List of valid supporting documents is available at List of Supporting Document

You can locate the nearest enrolment centre at : Bhuvan Aadhaar Portal