This study aimed to assess the telephone administration of the 12-month Ages and Stages Questionnaire (ASQ) and the 9- to 24-month Revised Prescreening Denver Questionnaire (R-PDQ) using the Antidepressants in Pregnancy Study cohort from the Organization of Teratology Information Specialists. The ASQ includes five domains (communication, gross motor, fine motor, problem-solving, and personal-social). The R-PDQ tests four areas of development (gross motor, fine motor, personal-social, and language). Both instruments were self and telephone-administered to mothers at 12 months postpartum. Concordance between the telephone and self-administration was assessed with intraclass correlation coefficients (ICCs) with 95% CIs. For the ASQ, concordance between test scores was substantial for the communication scale (ICC = 0.76, 95% CI [0.63, 0.85]), almost perfect for the gross motor scale (ICC = 0.83, 95% CI [0.73, 0.89]), and moderate for the fine motor, problem-solving, and personal-social scales (ICC = 0.43, 95% CI [0.19, 0.61]; ICC = 0.42, 95% CI [0.19, 0.61]; and ICC = 0.50, 95% CI [0.29, 0.67], respectively). Regarding the R-PDQ, concordance between test scores was as follows: gross motor (ICC = 0.90, 95% CI [0.83, 0.94]), language (ICC = 0.57, 95% CI [0.36, 0.73]), and personal-social scales (ICC = 0.26, 95% CI [0.00, 0.49]). For the fine motor scale, the correlation between both modes was 100%. The 12-month ASQ telephone administration could be an alternative for children developmental screening. Except the personal-social scale, the 9- to 24-month R-PDQ could be telephone-administered for prescreening development.