Late-preterm infants are the neonates whose gestational ages are from 34+(0-7) to 36+(67)weeks.Although they look like term infants,their organs are immature.So the incidence of complication and mortality in late-preterm infants are higher than those of term infants.Now people have gradually realized that we could reduce the incidence of late-premature birth by exploring the pathogenesis of late-premature birth and trying to intervene it.People also have found that some maternal risk factors during pregnancy lead to latepreterm birth easily,such as pregnancy hypertension,pregnancy anemia,premature rupture of membranes,etc.These factors have significant impacts on the growth and development of late-preterm infants after birth.This paper is to review the progress of some maternal factors of late-preterm infants and their short and long term risks.

Ghrelin is a kind of brain-gut peptides,which integrates the body's digestive function and energy metabolism in the brain-gut axis.Recent studies showed that Ghrelin can be detected in breast milk.It is increasingly becoming the focus that Ghrelin from both maternal and perinatal neonates has special biological effects on the growth and development of newborns.such as stimulating the growth of fetal skin cells and the formation of bone,helping the catch-up growth of intrauterine growth restriction fetus after birth, regulating the glucose metabolism and promoting the fat synthesis of premature infants,and improving the maturation of neonatal immune system.This paper reviews the structure and physiological function of Ghrelin.as well as its effects on the neonatal growth and body weight regulation.

Objective To study the differences of clinical manifestations,etiology and hospitalized outcomes of purulent meningitis in preterm and term infants.Method All preterm and term infants with purulent meningitis hospitalized in the Hospital from 2006 to 2015 were enrolled in this study.The data of neonate's condition,maternal condition,clinical manifestations,complications,etiology,treatment and outcomes of the preterm and term infants groups were compared.Result During the study period,44 preterm infants and 118 term infants were included.The time of onset for purulent meningitis of preterm infants group was statistically earlier than that of term infants group [11.2 (3.2,19.8) d vs.14.3 (5.6,23.9) d,P ＜ 0.05].The prognosis of preterm infants group was statistically worse than that of term infants group (P ＜ 0.05).Among them,the incidences of clinical manifestations in preterm infants group compared to term infants group were:fever (54.5％ vs.78.8％),seizure (11.4％ vs.26.3％),lethargy and poor response (59.1％ vs.38.1％),slow weight gain (9.1％ vs.0％),apnea (45.5％ vs.0.8％) and cyanosis (15.9％ vs.4.2％);all the differences between two groups were significant (P ＜ 0.05).The time of onset for purulent meningitis with complications was statistically earlier than those without complications [9.5 (4.1,20.5) d vs.13.8 (5.9,22.0) d,P＜0.05].The duration of treatment for purulent meningitis with complications was longer than that without complications [(42.2 ± 8.8) d vs.(28.7 ± 7.1) d,P ＜ 0.05],and the positive rate of pathogens was also statistically higher than those without complications (73.8％ vs.26.7％,P ＜0.05).Coagulase-negative staphylococcus was the main pathogen for both preterm and term infants group.Klebsiella pneumoniae was more common in preterm infants group than in term infants group (40.0％ vs.10.4％,P ＜0.05).Conclusion Preterm infants with purulent meningitis had early onset time,atypical clinical manifestations,and poor prognosis.The treatment course for purulent meningitis with complications is prolonged.The pathogens for neonatal purulent meningitis have already changed.The detection rate of conditional pathogens is increasing yearly,for which the clinicians should take note seriously.