Why is the most planned Baby of History called a Lamb?
The first crime as we would recognise it was the murder of Able, and this was because God was extra pleased with him, for giving up to Gods work a Lamb/Sheep/Ram compared to his murderers gift.
Jesus said in John 6.29 "...the work of God, is to believe on Him whom He sent."
So I thought I would research the nature of Lambs.

The Lamb Eclipses the Ram for the benefit of the Flock as the small Moon eclipses the hard to view Sun in both cases to give a gentle interface to the highest.
In the early days of Sheep farming, many Shepherds did not have ways to hold the herd together as it was moved about.
Instead of a Sheep Dog or a car to speedily intimidate the herd to keep together and run off in the right direction they had to shout directions to the Sheep directly.
So as they watched the Lambs growing, they earnestly looked for signs that a Lamb could respond well too directions.
Especially the Male Lambs, since they could lead the herd more easily.