PHARR, Texas—Of all the things that could make a baby fuss, U.S. Customs and Border Protection officers weren’t expecting this: $10,000 found stuffed into the diaper of a crying 15-month-old at the Pharr International Bridge.

Border officials say unusual bulges that turned out to be cash on two women traveling with the baby led inspectors to check the crying baby as well. Altogether, inspectors found $43,317 in undeclared cash on the women, baby girl and a man traveling with them.

The group was crossing into Mexico on Tuesday morning when they were stopped.

Authorities say the man, Esteban Soto Yanez, a Mexican citizen, was arrested on illegal entry charges. One woman, a resident alien, was released and the infant and her mother were deported to Mexico.