What is the ruling on burying a dead child in the forest due to the high cost of graves and the inability to purchase a grave in Muslim cemeteries?

If it is not possible to bury a Muslim in a cemetery designated for Muslims, then it is permissible to bury him in a desert or a forest. The ground should be leveled to prevent his exhumation. A Muslim should not be buried in the cemeteries of disbelievers. As for washing a deceased Muslim in a place where disbelievers are washed, there is no harm in it if no other place is available.