The council asked for help after a damning report by the Commission for Social Care Inspection found that the service was improving but concerns remained.
Last week the commission sent the council a 38-point list of recommendations identifying areas where improvements must be made over the next year.
The external support unit, which will include experts from high-flying authorities, is designed to help the city achieve this.
A new commission report, published last week, continues to place Birmingham in the bottom third of all authorities. But no decision will be made until November on whether it would remain a no-star council.
Peter Hay, strategic director of social care and health, said: "Child protection measures have been strengthened through increased investment, although improving children's services and the performance of frontline social workers remain a high priority."
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