Little Eleanor died from 31 body fractures and three separate brain bleedings that Dad Christopher Easy, 31, was trying to claim, as a result of him suddenly braking with her in the car.
The investigation revealed no evidence of an emergency stop or accident, and the jury at Norwich Crown Court found him guilty of manslaughter and negligence.
The court heard how Eleanor’s 36-year-old mother Carly Izzy hid her pregnancy, leaving her newborn in need of intensive care for the first few weeks of her life.
People who knew the couple told the court that Eleanor was given custard cookies, lemon cheesecake and even zucchini instead of milk.
The court ruled that Christopher of Thetford, Cambridgeshire, and Carly of Chadburg to Soffolk also left their fragile child alone.
Eleanor was found unanswered at home on December 18, 2019 and went to Norfolk and Norwich University Hospital and then to Addenbrook Hospital in Cambridge, where a CT scan showed catastrophic head injuries and recent bleeding between her skull and brain.
As well as Norfolk bone fractures Police said the child had signs of malnutrition.
She died on December 20, 2019.
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Experts say the three separate hemorrhages in the brain and multiple retinal hemorrhages were probably caused by compression or a blow to the head.
In October, a couple of months before Eleanor’s death, medical visitors noticed that she had bruises and scratches on her face, which Carly said were due to improper car seating, and claimed the scratches were self-inflicted.
Following the child’s death, her parents were arrested on suspicion of grievous bodily harm until a post-mortem examination led to their re-arrest on suspicion of murder in January 2020.
However, evidence showed that the mother was not there when Eleanor received a fatal brain injury, and therefore she was acquitted of murder charges.
Instead, Carly was found guilty of one charge of negligence.
The couple will be sentenced on April 29.
Inspectorate Lewis Cresk, who led the investigation, said: “Today my thoughts are as they were during this investigation and will always be, on little Eleanor.
“She was only 14 weeks old when she died, but her fragile body had 31 fractures and three separate hemorrhages in her brain.
“Eleanor’s parents, the same people who were supposed to protect and love her above all else and everyone else, have let her down on an unimaginable scale since she was born.”