A Nigerian woman, Chiaka Thelma has delivered six babies at the Woman’s Hospital of Texas over the weekend.

According to the hospital, on its Twitter handle, the odds of having sextuplets are estimated to be one in 4.7 billion.

According to the hospital the six babies were made up of four boys and two girls.

The hospital further  reveal that the babies were born between 4:50 a.m. and 4:59 a.m

The babies were born at weights ranging from 1 pound (0.4kg), 12 ounces (0.3kg) to 2 pounds (0.9kg), and 14 ounces (0.39kg).

They are in stable condition and will continue to receive care in the hospital’s advanced neonatal intensive care unit, according to the release.