If you are lucky there might be a mention of them in the burial registers (you'd have to guess cemeteries local to either the house or the local hospital) but a lot of the time they simply weren't recorded. Even if they are there, as something like "Stillborn son/dau of..." or "Infant of..." you might not get a grave reference, and this note might only be added if the parents arranged the burial rather than a midwife or hospital attendant. Your only real chance in that case would be if there was, as Jebber says, another burial on the same day and that grave might be identified by a headstone or reference, not that it means for sure that the child is in there. I think stillbirths were more often not recorded at all. The idea at the time was "forget this one, make a new one".