Final answer:
The correct statement indicating knowledge about introducing solid foods to infants is that infants can start eating solid foods at 6 months of age, which is related to developmental readiness and the emergence of baby teeth.
Step-by-step explanation:
Understanding the Introduction of Solid Foods to Infants
The correct statement that indicates an understanding of the introduction of solid foods to infants is: The infant can start eating solid foods at 6 months of age. This is in line with the developmental milestones that include the emergence of deciduous teeth around six months, which could also be a sign that the infant may be ready for more textured foods. However, it's important to note that before introducing solid foods, infants should exhibit signs that they're developmentally ready, such as being able to sit with minimum support and showing an interest in solid foods. The other statements are either too early, not developmentally contingent, or rely on the appearance of teeth, which is not a necessary indicator to start solids.