A woman in Mexico is due to give birth to nine babies within the next month -- to add to the four children she already has.

Karla Vanessa Castaneda Perez is scheduled to give birth by caesarian section in Arteaga, northeast Mexico, late May when she will be seven months pregnant, El Universal newspaper reported.

The 32-year-old -- who already has a four-year-old son and six-month-old triplets -- said she was struggling to sleep over concerns about buying enough milk, diapers and clothes for the babies.

Castaneda Perez described her pregnancy as a miracle, but said she was prepared for multiple births after her triplets were born on Nov. 4.

She told the newspaper, "The delivery is scheduled for May 20, but the doctors told me I can hold out for another month and achieve the complete growth of the babies so that they do not spend much time in incubators. It is too early to think about the babies' names, first we hope everything goes well, the pregnancy was normal, although now I have got an internal injury from the triplets' caesarian, but we are confident the birth will go well."

Castaneda Perez and her husband, Juan Bernardo Garcia Morales, appealed for public help to cover the cost of medical care.

The couple has no social security or private health insurance and need help to pay for incubators for their nine babies.

The Mayor of Arteaga, Ernesto Cepeda Valdes, said the town was prepared to provide necessary support during the birth. He said that neighboring towns were all "godparents" of the babies, so they would help the family.

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