Final answer:
"Provide a teething ring for the baby to chew on, as it helps soothe the discomfort during teething". Thus the correct option is 3.
Step-by-step explanation:
Teething is a common process for infants, typically starting around 6 months. Option 3 is the most appropriate advice to offer the guardian as it suggests providing a teething ring for the baby to chew on. This action helps alleviate the discomfort associated with teething by providing a safe object for the baby to gnaw on, soothing their gums and providing relief.
The other options contain inaccurate or potentially harmful advice. Option 1 suggests a link between teething and diarrhea, which isn't supported by scientific evidence. Hydration is crucial, but diarrhea during teething isn't a universal occurrence. Option 2's advice to consult a pediatrician if there are no signs of teeth by 6 months is somewhat misleading, as the onset of teething can vary widely among infants, and a delay in teething isn't necessarily cause for concern.
Option 4's suggestion to introduce solid foods early to expedite teething is incorrect and could pose a choking hazard. Solid foods should be introduced based on the infant's readiness, usually around 6 months, but not with the intention of hastening teething.
Overall, advising the guardian to provide a teething ring aligns with safe and effective measures to alleviate the discomfort associated with teething, ensuring the baby's comfort during this natural developmental stage.Thus the correct option is 3.