Baby Nisha's panicked parents rushed her to hospital after she wasn't feeding or gaining weight and her stomach had swollen.
Surgeons performed an ultrasound and discovered a huge cystic lesion occupying the whole of the abdomen, which was displacing her organs to the right corner of her stomach cavity.
Nisha’s mother Sumathi and her father Raju, from Mettupalayam, India, had no idea how severe her condition was.
Doctors at Sri Ganapathy Krishna Hospital told the Times of India: “It was only after the child began having issues breathing and having food and the stomach had grown to a noticeably abnormal size did they go to a private doctor in Erode.”
Niche was referred to paediatric and laparoscopic surgeon Dr D Vijayagiri with what was thought to be a large cyst.
He later diagnosed her with foetus-in-fetu - where a parasitic twin resides inside the host twin and feeds off their blood supply.
The incredibly rare condition occurs in just one in ten million patients.