A woman who made headlines a decade ago when she had her 13th child at 55, is now pregnant with quadruplets.

Annegret Raunigk, from Berlin, now aged 65, told Germany's RTL broadcaster she decided to try for another baby because her youngest daughter, who was nine, wanted a little brother or sister.

The Russian and English teacher's pregnancy followed several attempts at artificial insemination over the past 18 months. She is set to be the world's oldest mother of quads.

Her pregnancy will be documented by RTL, with the first interview screening on Monday evening.

"Certainly that was a shock for me," she told newspaper Bild am Sonntag.

"After the doctor discovered there were four, I had to give it some thought to begin with."

She had not considered it an option to reduce the number of embryos, she added.

Asked about the moral implications, RTL quoted her as saying: "I think one must decide that for oneself."