Shahin Khan, delivered the twins at the civic-run Sion Hospital yesterday morning, doctors said today, adding the mother and babies are doing fine.
Dr Suleman Merchant, Dean of Sion Hospital, said the conjoined twins, who weighed 4.5kg at birth, are not the usual type and have "a very complex internal architecture".
"Externally they have two separate heads and necks, but a partially common thorax, and are completely fused below the umbilicus level," he said.
The twins are under the care of Dr Paras Kothari, HOD of Paediatrics Surgery at the hospital.
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He said the team also includes paediatrics surgeons, neonatologists and anaesthetists.
According to doctors, conjoined twins are born 1 in every 2 lakh births and only 5-25 per cent survive.
The babies will require many more investigations, end of which the next course of action will be decided, Merchant said.
The hospital will provide free of cost medical care and future treatment of the babies, he said.