norman and his colleagues are cautious about their methods also because the data do not make apparent whether it was the anesthesia that contributed to the children ' s developmental deficits , or when it was an underlying condition that may have needed surgery and exacerbated the intellectual problems . of the more than 5 , 000 infants studied , 593 needed at least one surgery and just over 100 infants needed more than six before age 3 . there may be an unusual about this population of children that could have helped them vulnerable to learn problems and required they undergo surgery and anaesthetic .
Anesthesia causes learning disabilities.