A Charlottesville bakery is celebrating a milestone with a cupcake that soon-to-be moms claim has a mysterious power in its ingredients.

Expecting mothers are pouring into Cappellino's Crazy Cakes to try their lemon drop cupcakes. Now, 150 moms have the bakery to thank for sending them into labor.

Four-week old Trip Thraves will carry a mysterious honor for the rest of his life. He was the 150th baby induced by a lemon drop cupcake.

On Trip's due date, the doctor told his mother, Lauren Thraves, he wasn't ready to enter the world just yet.

"I went the day after that appointment and got the cupcake and five hours later, contractions started," she said.

Thraves couldn't believe that this cupcake from Cappellino's Crazy Cakes sent her into labor hours later. But baker Frank Cappellino says he's not surprised.

"I think that perhaps maybe after the moms eat this cupcake and it's so delicious that the babies are in the tummies saying ‘Oh I want to come out and get some more,' " he said.

So how does it work? Is it Cappellino's secret ingredients in the cake? Perhaps the fresh lemon juice and zest in the buttercream? Or just plain magic?

"As far as we know there's no scientific basis for what they put in the cupcakes to induce labor but myself and all of the doctors here have stories of patients who have gone into labor after eating the cupcake," said Dr. Carrie Sopata, a gynecologist.

Dr. Sopata and Cappellino agree - it comes down to chance.

"We average about 20 to 25 pregnant ladies a week here," Cappellino said.

That means the cupcakes don't work for everyone. But they have helped put 150 moms like Thraves out of their past-due misery.

"I was ready to be done," Thraves said with a laugh.

Cappellino says the shop can't wait to celebrate 200 lemon drop cupcake babies. And that may not be too far away.