Hello mam, root canal is certainly recommended for milk tooth..The tooth here in question appears to be a milk tooth molar...now this tooth stays till 9.5-10yrs of age and will be replaced by a premolar. Thus saving it will be imp.
Extraction: If the tooth is to be extracted is also a molar, do check with the pedodontist for space maintenance of the same area.
Next Steps
Get the child treated by a Pedodontist