resume manufacturing of Similac formulas at its plant in Sturgis.

The company also said that it increased production at other U.S.-based manufacturing plants and one in Ireland, and that it would supply the United States with more than eight million pounds of formula in August, an increase from the year before. But it noted it would take six weeks for the Similac product from the Sturgis plant to start to hit store shelves.

But some industry experts say it will take time for Abbott to gain back the market share it once had. “To be frank, there is a lot of consumer mistrust around Similac right now,” said Mr. Dittmeier of the W.I.C. program.

That could be a boon for Reckitt Benckiser, which has been running its formula manufacturing plants at full tilt all summer, hoping to hold on to the market share it has gained at Abbott’s expense. Its market share has climbed to nearly 60 percent from 35 percent before the recall, said Robert Cleveland, who oversees the Mead Johnson nutrition business at Reckitt.

“We remain committed to making as much formula as we can,” Mr. Cleveland said. “We continue to maximize our domestic manufacturing, running overtime and going 24/7.” He added that the company had received approval to bring in formula from its plants in Singapore and specialty formula from its facilities in Mexico.

Still, in late August, when Lori Sharp, a first-time mother in Port Hueneme, Calif., realized she was down to one container of Reckitt’s Enfamil Sensitive infant formula for her 3-month-old daughter, the formula was out of stock on Walmart.com.

Panicking, she scoured more websites and widened her geographic search. She eventually discovered a container of formula at a Target 40 minutes away in Moorpark, Calif. “I went into the store and they actually had four more, but their shelves were so bare,” Ms. Sharp said. “I bought all of them.”

In Georgia, some of the most acute shortages are in rural areas. Jennifer Kelly, who is the family services manager at the early Head Start program in Swainsboro, which is between Macon and Savannah, said trying to find formula earlier this summer had become a “daily chore.”

The 14 babies she watches drink seven different kinds of formula. She and her staff were often driving to Walmart, Walgreens or a local grocery chain or scouring Amazon for some of the more obscure brands.

“It’s not like it was a few months ago when the shelves were bare,” Ms. Kelly said. “I am hoping we are on the other side of this dilemma.”

When the formula shortage was at a crisis point in May, Ms. Robinson of Bucks County, Pa., created a Facebook group that connected parents around the country. The group, called Formula Hunters, does not exchange money to keep out profiteers who have been hoarding formula and seeking to resell it at a markup.

The group operates on the notion that a parent who buys a hard-to-find formula brand and sends it to another parent in the group will eventually be repaid when others do the same for them.

Formula Hunters now has 1,500 members, who are still actively helping each other locate formula. “This has been going on for so many months,” Ms. Robinson said. “The frustration has been high.”

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