〔Abstract〕 Objective To investigate the correlation between nocturnal sleep duration combined with snoring in the first trimester of pregnancyand small for gestational age(SGA), large for gestational age(LGA). Methods Multivariate Logistic regression model was used to analyze the association between nocturnal sleep duration, snoring, their combined effects and SGA, LGA. Results Compared to nocturnal sleep duration 7 to 9 h in the first trimester of pregnancy, sleep duration<7 h was positively correlated with SGA in male newborn(OR=4.22, 95%CI: 1.69-10.52); After stratified by snoring, the sleep duration of snoring women<7 h was positively correlated with SGA(OR=5.68,95%CI: 1.02-31.51), and the sleep duration of non-snoring women<7 h was positively correlated with LGA(OR=2.10, 95%CI: 1.16-3.81). Conclusion Sleep duration<7 h in the first trimester of pregnancy is a risk factor for SGA and LGA, and snoring may enhance the association between sleep duration<7 h in the first trimester of pregnancy and SGA. Pregnant women should keep adequate nocturnal sleep duration to reduce the risk of abnormal neonatal weight.