Final answer:
The most suitable lunch menu for an 18 months old infant is option c, as it provides a balanced diet with appropriate textures and whole milk, which is vital for development.
Step-by-step explanation:
The most appropriate lunch menu for an 18 months old infant would be c. sliced turkey, rice, sliced cucumbers, applesauce, and whole milk. Considering the dietary requirements for toddlers, this menu offers a balanced meal with protein, vegetables, fruits, grains, and suitable fat content from whole milk. Cow's milk, which is not recommended for infants below one year due to difficulties in digestion and unsuitability of its composition, should be fine for an 18 months old, but it should be whole milk to ensure the fat needed for brain development.
It is important to remember that at this age, foods should be cut into small pieces to prevent choking hazards. Whole wheat bread, broccoli, and lettuce, as well as other items from the other options, might be more difficult for a young toddler to chew properly. Additionally, 2% milk contains less fat than whole milk, which might not be ideal for a toddler's nutritional needs that include a higher amount of fats for development.