FDA's regulations, not guidelines, are published in the Code of Federal Regulations, No 21, parts 100 to 169, revised April, 1996. The information on infant formula runs from pg. 181-190 #107.10 and consists of five parts, A) general provisions, b) labeling, c)exempt infant formula, d) nutrient requirements and e) infant formula recall. Unfortunately, you have to purchase the entire book which runs about $15.00 from: US Govt Printing office, Superintendent of Documents, Mail stop:SSOP, Wash, DC 20402-9328. Barbara Hayes, RN