Researchers have found that "Use of a pacifier is associated with a substantial reduction in the risk of SIDS". (Sudden infant death syndrome) . A meta-analytic study published by American Pediatric Association in Pediatrics in October 2005 supports this benefit to 1 year of age.. However other experts while acknowledging the correlation between SIDS risk reduction and the pacifier use, questioned the causality of the findings.

A newborn's shoulders and hips are narrow, the abdomen protrudes slightly, and the arms and legs are relatively short. The average birth weight of a full-term newborn is approximately 7 ½ lbs.(3.2 kg), but is typically in the range of 5.5–10 pounds (2.7–4.6 kg). The average total body length is 14–20 inches (35.6–50.8 cm), although premature newborns may be much smaller. The Apgar score is a measure of a newborn's transition from the uterus during the first minutes of life.

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