Babies older than 3 months who cry uncontrollably without reason are at greater risk of suffering from lower IQ, hyperactivity and discipline problems in childhood, new research has found.
Persistent crying for periods longer than two weeks after that age may suggest subtle neurological problems that are later responsible for developmental deficits, federal government researchers reported the Archives of Disease in Childhood.
Persistent and unexplained crying when babies are younger than 3 months -- commonly known as colic -- was not associated with cognitive problems later on.
The study was based on 327 children in Norway and Sweden who were evaluated at 6 and 13 weeks and had their IQs measured when they were 5. While the study was small, the researchers said the stark differences between the groups strengthened their confidence in the results.
-- Washington Post