Final answer:
The presence of the tongue thrust reflex would indicate that an infant is not ready for solid foods. Other assessment signs like the ability to sit unsupported, weight gain, and presence of teeth are generally indicative of readiness.
Step-by-step explanation:
An assessment sign that would indicate an infant is not ready for solid foods is the presence of the tongue thrust reflex. This reflex, where an infant pushes their tongue against anything put into their mouth, helps prevent choking and is necessary for successful breastfeeding or bottle-feeding. However, this reflex typically diminishes as an infant matures and develops readiness for solid foods, usually around 4 to 6 months of age.
The remaining options are given in the question point towards an infant's readiness for solid foods. For example, the ability to sit unsupported indicates that an infant has enough head and neck strength to eat solid foods. Weight gain shows that the infant is growing properly, and the presence of teeth can help with managing solid textures, though the lack of teeth is not necessarily a sign of unpreparedness for solid foods.
Additional Indicators of Readiness for Solid Foods
- Loss of the tongue thrust reflex
- Ability to pick up food and try to put it into their mouth
- Increased interest in foods when other family members are eating
Each infant develops at their own pace, and while there are common milestone indicators, it is essential to consider each child's unique development when deciding to introduce solid foods.