The children - aged one and two - were murdered by men with a known history of drug abuse and violence.
Police, children's services, probation and health agencies were among agencies implicated in the serious case review reports.
The reports said a number of failings contributed to a lack of understanding among agencies about the level of safeguarding risks involved.
These included a preoccupation by professionals with the behaviour of the men rather than on the safety of the children.
The damning reports follow a Department for Education announcement last month that Ofsted-rated "inadequate" children's services in Northamptonshire would be turned over to a new independent children's trust.
This trust creation is part of a wider set of proposals to reorganise services, currently delivered via a two-tier system of county, borough and district councils.
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