“…Typical neurological symptoms in infancy are irritability, weakness, developmental delay and failure to thrive, finally apathy and coma [6,9,10,12]. Epilepsy has been described as a rare manifestation of infantile vitamin B12 deficiency [4,6,9,14]. Moreover, there are isolated reports on an association with infantile spasms syndrome (ISs) and its subset West syndrome [2,7,8].…”