Which of the following is NOT a sign of withdrawal in a newborn?

High birth weight is not a sign of withdrawal in a newborn. Withdrawal symptoms in newborns are typically associated with the exposure to substances, such as opioids, during pregnancy. These symptoms can manifest in various physical and behavioral indicators.

Tachypnea, or rapid breathing, is commonly observed in newborns experiencing withdrawal, as their bodies may react to the absence of the substance they were exposed to in utero. Irritability is also a prevalent withdrawal symptom; newborns can exhibit increased fussiness and difficulty being consoled. Tremors are another sign that may be seen in infants undergoing withdrawal, as their nervous systems respond to the sudden change in their environment and the lack of substance exposure.

In contrast, high birth weight does not indicate any withdrawal symptoms. It may sometimes reflect a healthy prenatal environment or could be associated with other factors but does not relate to withdrawal status in the context of substance exposure.