Medical Must-See: Infant’s development held back by twin in her brain 

The phenomenon was discovered when the one-year-old presented with motor delay and enlarged head circumference.

The term ‘baby brain’ is usually a light-hearted reference to the thought fog that can accompany pregnancy and caring for a newborn. 

But it also has a more literal meaning, with neurologists in China reporting a rare case of a one-year-old girl who had her twin’s fetus buried in her brain.