Abstract: Objective To explore the effectiveness of monitoring for developmental delay (DD) and the feasibility of firsthand data reporting among 0~3 years old children. Methods A study population consisted of a cluster sample of 20907 children aged 0~3 years, from 22 communities in 5 districts in Beijing, was monitored for 1 year using questionnaires and data reports. The results were compared against the non-project communities. Results The screening rate of DD was 62.18%, higher than the non-project groups, and the rate of 0 year old group was significantly higher than the other groups. 268 children were positive screening, referral of 253 children, the referral rate was 94.4%; 97 children were diagnosed as DD with the prevalence rate of 7.46 ‰; 43.28% of the children received intervention and rehabilitation training. Conclusion The surveillance means of DD for 0~3-year-old children are effective and the firsthand data report is feasible

Key words: developmental delay, growth monitoring, firsthand data reporting