On September 12, 2017, Mason Garrett Duggar was born at 1:20 am. He weighed 9 pounds and 1 ounce and was 22 inches long.
When Mason was two weeks old, he started experiencing reactions to a then-unknown allergy. He was temporarily switched to formula while Anna cut a number of common allergens out of her diet. Eventually, it was determined that he had a milk protein allergy, and he was able to resume nursing. Since then, he has been healthy and his parents have been able to manage his allergy through keeping dairy from his diet.