Group 1: Healthcare professionals w  HCP will be recruited to the behaviour change and implementation science evaluation study at SMCH, KCH and CPH. Qualitative and quantitative methods will assess acceptability, feasibility and usability of the NeoTree. We estimate a sample size of 160 across sites addressing each aspect, and will carry out an assessment for data thematic saturation before conducting any further interviews (Sample size ~160). An additional 30 HCPs will be recruited to the health economic cost data.  Inclusion criteria:  working as a healthcare professional or manager caring for newborns admitted to SMCH, KCH or CPH newborn care units during the study period Willing and able to give written or audio informed consent for participation.  Exclusion criteria:  ● aged over 65 years (Zimbabwe only); No upper exclusion age in Malawi  Group 2: Parents/ carers  A qualitative study will be conducted with families and carers of newborns admitted to the intervention hospitals to assess acceptability of the NeoTree (Sample size ~30, followed by analysis for thematic saturation prior to carrying out further interviews).  Inclusion criteria:  Parent/carer of a live newborn requiring admission to SMCH, KCH or CPH newborn care units during the study period Willing and able to give written or audio informed consent for participation.  Exclusion criteria:  ● Parents aged under 18 years (Malawi) and under 16 years (Zimbabwe)  Group 3: Newborns admitted to newborn care units  Inclusion criteria:  Anonymous individual data will be collected prospectively for all babies admitted to the newborn care units of SMCH, KCH and CPH until the end of the study (anticipated April 2022) anonymous individual data will be collected retrospectively for all babies admitted to newborn care units of Bindura Provincial Hospital and Parirenyatwa Hospital during April and October 2021 or beyond.  Exclusion criteria:  ● none