Hayek's own daughter Valentina turned one just before she took the trip.
She spoke of the incident recently, and it turns out "Nightline" aired video of the feeding.
"The baby was perfectly healthy, but the mother didn't have milk. He was very hungry. I was weaning Valentina, but I still had a lot of milk that I was pumping, so I breast-fed the baby. You should have seen his eyes. When he felt the nourishment, he immediately stopped crying."