This week, a source told the Herald on Sunday Guerrero-Nieto was caring for the baby girl in the mother and child unit at Auckland Women's Prison.
Guerrero-Nieto does not speak English.
"She does get visits from a nun who speaks Spanish," said the source.
The source did not know who the baby's father was, and neither Guerrero-Nieto's lawyer, David Niven, nor authorities would name him.
The Herald on Sunday has seen Guerrero-Nieto holding hands with co-accused Beltran-Velez in the dock.
The pair and Casal-Carmona, were caught last November after a drug dog detected cocaine in their luggage when they arrived in Auckland on a flight from Chile.
They were waiting to board a flight to New Caledonia when they were arrested.