Orlando Ramirez-Leal and Cynthia Elizabeth Uresti were arrested Wednesday after crossing the Gateway International Bridge using the pedestrian lane, court documents show.
Border agents searched the mother and her child, finding six bundles containing about 7 pounds of meth, the documents say. It's unclear how they were concealed on the toddler.
Uresti admitted knowingly transporting the meth into the U.S. from Mexico and said they were taking the drugs to Houston to be sold.
She and Ramirez-Leal are being held on charges of drug possession with intent to distribute.
