TY - JOUR A1 - Johnson, S.B. A1 - Kuehn, M. A1 - Lambert, J.O. A1 - Spin, J.P. A1 - Klein, L.M. A1 - Howard, B. A1 - Sturner, R. A1 - Perrin, E.M. T1 - Developmental milestone attainment in US children before and during the COVID-19 pandemic Y1 - 2024 DO - 10.1001/jamapediatrics.2024.0683 VL - 178 IS - 6 ER -