Mariah Blake arrived three weeks early
A woman gave birth on the pavement outside the Leicester Royal Infirmary after being told to make her own way to the hospital when she went into labour.
Carmen Blake, 27, who lives about 100 metres from the hospital, was told to walk rather than have an ambulance.
A passer-by helped deliver the healthy baby girl, named Mariah, before paramedics made it to the scene.
A hospital spokesman said they wanted people to be happy with their care and they would investigate any complaint.
Ms Blake, who has three other children, gave birth on 2 August.
She said: "They should have sent an ambulance, knowing that the more children you have the quicker the labour is.
"But I was sent no-one and was told to walk over - by myself."
She added: "Now I would like to have an apology from the hospital and an acknowledgement of how traumatic the experience was for me."
She also thanked the passer-by, a physiotherapist who she described as "fantastic", for her help.
A spokesperson from Leicester's Hospitals said: "Of course it's disappointing that Ms Blake was not happy with the advice and care she received and we will investigate any complaint we receive.
"We are pleased that both Ms Blake and her daughter are well and healthy."
A mother wants an apology from a hospital after giving birth on the street