Lightest birth
245 gram(s)
United States (San Diego)

The lowest birth weight recorded for a surviving infant, of which there is definitive evidence, is 245 grams (8.6 ounces) in the case of "Saybie" (USA; real name protected for privacy reasons), who was delivered by emergency Caesarian section at Sharp Mary Birch Hospital in San Diego, California, USA, in December 2018 after a gestation of just 23 weeks 3 days.

Although the family preferred to remain anonymous, Saybie's weight was confirmed by staff at Sharp Mary Birch Hospital and the Tiniest Babies Registry. She is now living back home, and has a full bill of health.

Dr Paul Wozniak, the physician who was part of Saybie’s resuscitation team after her birth, told us: “I’ve attended the births of many micropreemies over the years, but Saybie’s birth was definitely unique. Based on her gestational age (23 weeks + 3 days) and, more importantly, her incredibly small size at birth, her prognosis was bleak, and we weren’t sure she would survive. Upon Saybie’s examination in the delivery room, the team determined that Saybie had a strong heartbeat and I intubated her, and the neonatal resuscitation team stabilized her so she could be transferred to our NICU for continuing intensive care. Saybie was actually so small that we could not get the in-bed scale to register any weight. It wasn’t until she was transferred to our NICU, where we weighed her on an old-fashioned scale, that we realized she was only 245 grams, or 8.6 ounces. It’s been an honor to have been a part of Saybie’s care team, and to have the privilege to watch her grow, thrive, and exceed all expectations. Saybie and her parents became, and will always be, part of our Sharp Mary Birch NICU family."

A full-term baby is born at 39–40 weeks gestation and typically weighs in the region of 2.7–4 kilograms (6–9 pounds).

Photo credit: Matthew Helbig, Sharp HealthCare