Final answer:
The best initial solid food to introduce to infants is pureed meat, due to its high iron content which is crucial for infants around 6 months old. Other options like cereals and applesauce can also be introduced but have less iron. Teething biscuits are not recommended as a first food.
Step-by-step explanation:
The best first solid foods to introduce to infants is pureed meat. This option is rich in iron, which is an important nutrient for infants starting at about 6 months of age. Infants begin to need additional iron in their diet at this time, and pureed meats can provide the necessary nutrient in a form that is easy for them to digest. Options like cream of wheat cereal and applesauce come in next as they are also commonly recommended, but they contain less iron than meat. Teething biscuits are generally not considered a good first food due to the potential risk of choking and the lack of essential nutrients.