This subject that has been hugely researched in recent years and the current recommendation from the World Health Organisation (since 2001) is- no solid foods are introduced to baby for the first 6 months. Other health organisations have updated their recommendations for the introduction of baby's first food to meet with the guidelines issued by WHO.
UNICEF
http://www.unicef.org/nutrition/inde...stfeeding.html
AAP (Revised February 1, 2005 to reflect current standards of the medical community)
http://aappolicy.aappublications.org...ics;100/6/1035
Canadian Pediatric Society
http://www.cps.ca/English/statements...edingMar05.htm