**Core Concept**
Botulism is a rare but potentially life-threatening illness caused by the toxin of Clostridium botulinum. The spores of C. botulinum can be ingested, and the toxin is produced when the spores germinate in an anaerobic environment.

**Why the Correct Answer is Right**
The infant botulism syndrome typically presents with weakness, floppiness, and feeding difficulties due to the toxin's effect on the neuromuscular junction. The toxin, botulinum neurotoxin (BoNT), binds to the synaptic vesicle protein SV2 at the motor neuron terminal and prevents the release of acetylcholine, leading to flaccid paralysis. This condition is often associated with the ingestion of contaminated honey or other foods.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is not relevant to the presentation of infant botulism.
**Option B:** This option might be related to another condition, but not specifically to infant botulism.
**Option C:** This option is incorrect because it does not accurately describe the presentation of infant botulism.

**Clinical Pearl / High-Yield Fact**
Infant botulism is a classic exam trap, and its presentation can easily be confused with other conditions such as myasthenia gravis or Guillain-Barré syndrome. However, the key to diagnosing infant botulism is the presence of a history of honey ingestion or other contaminated foods.

**Correct Answer: C. Constipation.**