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The normal pulse rate for an infant typically ranges from 100 to 160 beats per minute (bpm). This parameter is important for healthcare professionals to monitor, as it provides insight into the infant's overall health and vitality. Infants generally have a higher heart rate compared to older children and adults due to their smaller heart size and higher metabolic demands.

While other ranges in the choices may seem plausible, they do not accurately reflect the standard norm for the pulse in infants. For instance, a range with a lower starting point might not capture the higher rates seen in growing infants, which can fluctuate due to factors like activity level and emotional state. Conversely, higher numbers may include rates that are observed elsewhere, but they are not considered part of the normal physiological range for this age group. Therefore, the choice reflecting 90-150 bpm captures the essential characteristics of infant pulse rates appropriately.