Real World article(written from a Production point of view)
Nolan Donahue and his brother Brett portrayed the infant Q Junior in the Star Trek: Voyager third season episode "The Q and the Grey". They received no credit for their appearance and were identified by the name tag of the jumpsuit which was sold off on the 40 Years of Star Trek: The Collection. 
According to the call sheet, they filmed their scene on Monday 16 September 1996 on Paramount Stage 8 and are listed as "2 Babies (Donahue Twins)" on the call sheet.
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