Mini-midwife Francesca Goodby first helped her mum Kay deliver younger sister Roisin two years ago on the bathroom floor.
And now she's helped out with the delivery of little sister Saoirse, fetching towels and holding the baby's head when she was born facing the wrong way round.
Proud mum Kay, 30, told Metro: "We're so very proud of her. She was the calmest person in the house, she kept telling me to stay calm and helping me to breathe.
"And even when we realised the baby was being born the wrong way she was able to hold the head and keep her safe.
"Her dad had to look after Roisin in the other room so Francesca was shouting through to tell him what was going on, she would tell him when the head was out and if everything was OK.
"Michael was on the phone to the 999 operator relaying the information Francesca was telling him, so it was a team effort."
Two years ago, when Francesca, from Bearwood, Birmingham, was six, she sprang into action when her mum went into labour on the bathroom floor - by following a drill she learned from Casualty.
Francesca helped with Kay's breathing, fetched towels and made sure the umbilical cord was not wrapped around the baby's head.
This time round, Francesca was more than prepared after her first delivery experience.
She said: "I knew what to do from the last time I helped mummy have a baby.
"As soon as mummy said she was pregnant I was preparing just in case it happened again.
"I just had to stay calm and keep bringing towels and keep telling daddy what was going on.
"Then I held the head while she came out. It wasn't scary, I was excited and glad to help."
What an impressive girl!