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Three baby girls found abandoned in Berlin over two years are all sisters and are believed to have the same mum - and possibly the same dad.

Police are hunting for the mother of all the siblings, who they believe is between 20 and 30 years old and would have been clearly heavily pregnant between 2015 and 2017.

All the children, who underwent DNA tests, now live in foster care, but officers from Berlin and Brandenburg police are keen to locate the woman.

The eldest of the three was found on the floor of a bus stop, in September 2015 at the side entrance of the Helios Klinikum Berlin-Buch Hospital.

(Image: Polizei Berlin)

The child was suffering from hypothermia and had been left on a pillow wearing a diaper, a blood stained romper and a little hoody.

Police said it appeared the woman had given birth without any medical care, reports

Despite police appeals, including releasing CCTV and numerous pieces of information from the public, they never managed to find the mother.

In the second instance in August 2016 a baby was found on the doorstep of a home in Pankow in the early hours of the morning.

(Image: Polizei Berlin)

Police pictures show the towel the girl was wrapped in was covered in blood - and another one used to cover her had been taken from the homeowners.

Little has been reported on the the third child, who was found in August 2017.

Currently, a note has been received from an anonymous source, which police say they are investigating.

Police are appealing for information that might help them find the mother because she endangered the children's lives by not using one of Berlin's baby boxes, which allow women to give up their babies anonymously and alert medics to the presence of the infant.

Campaigners for the "Babywiege" - a Baby Cradle - say the heated box, monitored by nurses, is better for babies than being abandoned on the street.

But people who oppose them claim it could allow abusive fathers to 'dump' the babies against the mother's wishes - and evading any prosecution.