Adding important information to this:
95% of all cases occur in infants 6 months old or younger, and more then 50% of those occurred in babies under 2 months. That doesn't mean feed your 7-month-old honey, it means maybe don't freak out that your aunt fed the 11 month baby honey grahams. Just watch for the symptoms.
The symptoms are reduced gag reflex, floppiness (especially in ways babies funny normally flop), difficulty feeding, constipation, loss of facial expressions, difficulty breathing, and an altered cry.
Not all honey has the spores, and not all babies digest slowly and not all babies have microbiomes that will support the growth. If your baby accidentally gets honey, don't freak out, just watch for symptoms.
Seriously, there are only three factors besides age that indicated severity and likelihood of getting infant botulism; number of bowel movements and whether the child was born via C-section are two of them. Avoid antibiotics if at all possible, breastfeed, and stop sanitizing everything.
Honey is not the only source. The bacterial spores are also going in soil and dust, which means day to day life is a risk. (That fourth factor was windiness in the area.) Again, not advocating to feed the baby honey. What I am saying is that it's always a risk and you should be monitoring your baby in general for changes in behavior regardless of how careful you are.
