The mortality rate of premature infants had close relation with gestational age, birth weight and sclerema neonatorum.
早产儿死亡率与孕周、体重密切相关，并发硬肿症者死亡率更高。
英语百科
Sclerema neonatorum
Sclerema neonatorum is a rare and severe skin condition that is characterized by diffuse hardening of the subcutaneous tissue with minimal inflammation. It usually affects premature, ill newborns. Prognosis is poor.
Minimal inflammation helps distinguish sclerema neonaturum from subcutaneous fat necrosis of the newborn.