Objective This study aimed to examine the sleep arrangements and soothing methods and to assess their associations with sleep problems among children aged < 3 years in China. Methods A cross-sectional survey was conducted in 2019 from six provinces in China. A total of 1,195 caregivers of children aged 0–35 months were included in the study. Data on sleep arrangements, soothing methods, and sleep problems (i.e., frequent night awakenings and difficulty falling asleep) were assessed using the Brief Infant Sleep Questionnaire. The reasons for bed-sharing in sleep arrangements were recorded using a self-designed questionnaire. Results The bed-sharing practice was very prevalent at any age, which ranged from 69.9％ to 78.3％. Most infants fell asleep while feeding or being rocked/held before age 12 months. By age 35 months, 62.4％ of the children fell asleep in bed near parents. The most common reasons for bed-sharing were breastfeeding/feeding and convenience. Parental involvement when falling asleep was significantly related with frequent night awakenings and difficulty falling asleep. No association was found between bed-sharing and sleep. Conclusion Bed-sharing and parental involvement were very common among Chinese children aged < 3 years. Children who fall asleep with parental involvement were more likely to have sleep problems.