Rulings on miscarried fetuses

Q: I would like to ask Your Eminence about miscarried children in the morgue of Tarif hospital. There are twelve of them; the first has been there since 1406 A.H. And the last has been there since 1416 A.H. The dates of the admission of some of them are unknown. Moreover, there are separate limbs scattered like fingers, hands and the like. I asked the manager of the hospital to tell the governor that those children have been for a long period of time in the morgue of the hospital and their parents did not receive them and that there is no sufficient information to know the addresses of their parents and that there is someone who offers to take their bodies and perform the necessary procedures to bury them, they agreed that I can receive them and wash, shroud, pray for, and bury them. My question is:1- Is it permissible for me to receive them without the knowledge of their parents taking into consideration that it is impossible to know their addresses because the available data of addresses are not enough and the cases have been in the hospital for a very long period of time? (Part No. 7; Page No. 244) 2- As for the miscarried fetuses which completed four months; they should be washed, shrouded, offered Janazah (Funeral) Prayer for, and buried in the public graveyard of Muslims. What is the ruling if the miscarried fetus is under this age? Is it permissible to throw it in the dump or in the sewerage system?3- The age of some of those children in the morgue cannot be distinguished as a result of the change of their bodies and colors and the complete atrophy of their bodies, how should we behave in this case?4- Is it permissible to bury two or three of them in one grave, how should it be done?5- What is the ruling on washing, shrouding, offering prayer, and burying the limbs?