Which behavior indicates fullness in infants aged 4 months to 6 months?

The behavior that indicates fullness in infants aged 4 months to 6 months is stopping sucking. When infants are full, they demonstrate this by ceasing to suck or actively pulling away from the breast or bottle. This natural response signifies that they have received enough nourishment and are no longer hungry.

Recognizing fullness in infants is crucial for parents and caregivers, as it helps with establishing a healthy feeding routine and prevents overfeeding. In this age group, stopping sucking can also be accompanied by signs of contentment or relaxation, further confirming that the infant has satisfied their hunger.

The other options, while they may reflect various behaviors or developmental milestones in infants, do not specifically indicate a state of fullness. For instance, reaching for food might suggest interest or eagerness to eat rather than the completion of a feeding. Similarly, waving hands may be a part of normal exploration or play, not necessarily tied to hunger or fullness. Falling asleep can occur due to tiredness or a soothing environment, which doesn’t provide a clear signal of being full either. Thus, stopping sucking is the most definitive behavior signaling that an infant has reached their capacity for feeding at this developmental stage.