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Investigators allege Herrera-Garcia's wife, Grei Mendez, called him before calling 911 as the babies showed signs of an overdose. One-year-old Nicholas Dominici died and three other babies were hospitalized.
Police have already arrested Mendez, Herrera-Garcia's cousin, Carlisto Acevedo Brito, and an alleged associate, Renny Paredes.
Renny Antonio Parra Paredes, third person arrested in toddler's overdose death at Bronx day care, arraigned in federal court
Federal authorities claim the four were operating a drug ring out of the day care and have found large quantities of narcotics hidden under the floor boards.
"It would be indicative of a larger-scale steady distribution network that built up customers and clients and has resources and connections to Mexico," said Ray Donovan, retired chief of operations for the Drug Enforcement Administration.
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Donovan said Herrera-Garcia attempting to go to Culiacan was significant, because it's the main operational center for the Sinaloa cartel.
"That cartel is the largest producer, manufacturer and trafficker of fentanyl to the U.S.," Donovan said, adding, "It tells me he was going there for protection. So it made sense for him to take a bus to lay under the radar and go directly into Culiacan to lay low for a period of time."
Sources said U.S. and Mexican authorities worked together on the arrest and the extradition process will now begin.
CBS New York has learned daycare suspect Felix Herrera-Garcia was arrested in Mexico while on a bus to the city of Culiacan, which is a hub for the most powerful drug cartel in the world. Herrera-Garcia was last seen carrying bags out the back alley of Divino Nino Day Care on Sept. 15, after parents left their babies for daycare and were exposed to fentanyl. One died.
With the border being so secure, how are they getting the drugs in the country?
Just another dab of that good old liberal diversity strength.
And arrested one guy? Why not take out the cartel at the same time?