Iron, VitD Deficiency When Pregnant, Has Kactise Intolerance. Unable To Move Arm, X-ray Says Supracondular Fracture. What Is This ?

Hi I had iron deficiency when pregnant and very low vitamin d, he was then diagnised with kactise intolerance when birn sling with reflux pribkems. when my baby was 9 months old my partner and me took him to our local a&e as he wasn't moving his arm as usual, the triage docter couldn't see any abnormalities and the docter didn't either but said it may if been a pulled elbow. She reduced his arm and heard a noise and thought she had solved the problem but it got worse and so we were sent for a X-ray which came back as a supracondular fracture!!!!! The next nurse to see him said his arm then looked deformed but 2 previous didn't see any deformities else why would they manipulate a deformed arm. I suppose my question is could me having low iron and vitamin d of affected him or lactose intolerance? And could the nurse who manipulated have done any damage??
Thanks for your time