In 2005 [7] the FSA found that all cases in the past 30 years of infantile botulism in the UK were due to, ironically, baby food.
The CDC [2] states
“A baby contracts ("gets") infant botulism by swallowing the botulism spores at a moment in time when the baby's large intestine is vulnerable to spore germination and toxin production. Medical science does not yet understand all the factors that make a baby susceptible to botulism spore germination. Honey is the one identified and avoidable source of botulinum spores. By a process of exclusion (testing over the years of hundreds of foods, beverages and other items placed in infants' mouths with negative results), it was concluded that most infant botulism patients acquired their spores by swallowing microscopic dust particles that carry the spores.”
The link between IB and honey is a bit weak, though there is an element of plausibility. It is all raw foods that pose an IB risk and really there is no need to give honey to a under 26 week infant.
References:
[1] www.honey.com/downloads/infantbotulism.pdf
[2] http://infantbotulism.org
[3] www.cdc.gov/ncidod/dbmd/diseaseinfo/files/botulism.PDF
[4]jcm.asm.org/cgi/reprint/9/2/282.pdf
[5] Arnon SS, Midura TF, Damus K, Thompson B, Wood RM, Chin J. Honey and other environmental risk factors for infant botulism. J Pediatr 1979;94:331-6.
[6] http://www.guardian.co.uk/science/2005/aug/25/health.society
[7]http://www.food.gov.uk/multimedia/pdfs/infantbotulismreport.pdf
