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ByHeart, which makes organic infant formula, has recalled all of its products sold throughout the U.S. amid a growing outbreak of infant botulism. A California health official says the outbreak, which started in August, has now sickened at least 15 infants in 12 states.

Health and Human Services Secretary Xavier Becerra welcomed the delivery of baby formula into DFW Airport Thursday afternoon.

Empty store shelves. Frustrated parents. The formula shortage has upended life for millions of families across the nation and magnified longtime disparities in how infants receive nutrition.

But Abbott has said that, after production resumes, it could take about two months before new formula begins arriving in stores. The company's factory has been closed due to contamination problems.

Just a handful of formula makers dominate the industry so a single plant shutdown can lead to empty shelves.