Penzias, RE, Ondieki Ogero, M, Tillya, R, Kassim, I, Dosunmu, O, Odedere, O, Mwaniki, H, Ochieng, VO, Mochache, D, Ngwala, SK, Zimba, E, Soko, GT, Bohne, C, Gathara, D, Cross, JH, Shabani, J, Paul, C, Shamba, D, Masanja, H, Salim, N, Osuagwu, C, Idowu, A, Ifeanyichukwu, AO, Tongo, O, Ogunsola, OO, Ezeaka, VC, Rashid, E, Okello, G, Wainaina, J, Macharia, WM, Chiume, M, Chalira, A, Dube, Q, Gicheha, E, Molyneux, EM, Alooh, M, Cousens, S, Oden, M, Richards-Kortum, R, Lawn, JE and Ohuma, EO (2025). Data for: "Small and sick newborn care: Changes in service readiness scoring between baseline and 2023 for 65 neonatal units implementing with NEST360 in Kenya, Malawi, Nigeria, and Tanzania". [Data Collection]. London School of Hygiene & Tropical Medicine, London, United Kingdom. https://doi.org/10.17037/DATA.00004609.