[header] How to recognize infant botulism [title] Take note of unexplained constipation. [step] This is first sign of your baby being infected with botulism. [substeps] If your infant has gone more than 3 days without defecating, it indicates your baby is constipated. 
Although constipation can be sign of botulism infection, it can also be due to inadequate feeding. It usually takes 18 to 36 hours for the symptoms to take effect after infection.