While the Covid-19 pandemic brings a brutal hit to social members, it also affects child development. Nevertheless, there is still a research gap about how the pandemic has influenced Chinese infants and toddlers development. Under such a circumstance, this quantitative research aims to identify and evaluate the psychological influence exerted by the pandemic. Based on practical developmental screening tools such as ASQ-3 and ASQ: SE-2, the survey was oriented to 9 participants in their infancy or early childhood from Baby Friendly East, a China-based early childhood education organization. The descriptive analysis of these survey takers scores and the thematic analysis of their parents interviewee responses reveal crucial findings: 1) the pandemic has exerted negligible influence on five aspects related to ASQ-3; 2) the pandemic obviously adverse influence on the seven areas of social-emotional development; and 3) interviews oriented to parents of sampled infants and toddlers underlined specific ways for the pandemic to take effect on child development, including changes in family environment and parent-kid bond, reduction in outdoor activities, and emotional regulations and childrens susceptibility to sleep problems. These findings are supposed to bring positive implications for policy makers, communities and parents to work out feasible and effective interventions to offset negative pandemic-related influence on infants and toddlers development.