The short answer is he probably wasn’t. The more important answer is that there was a reason for the humble birth of God’s son–a reason that predates time itself.
First let’s address the place of Christ’s birth. Joseph and his betrothed wife, Mary most likely walked the 100 miles from Jerusalem to Bethlehem in a caravan of others heading to their ancestral homes in the south to register for a census decreed by Caesar Augustus. Since Jews avoided contact with Samatarians, those who lived between Nazareth and Bethlehem, they would have traveled on a route that followed the Jordan River east of Samaria. The one-to two-week, 100 mile journey, brought them to the small village six miles south of the temple in Jerusalem.
There, like most of their fellow travelers, they would have sought lodging with relatives. The Bible tells us there was no room for them in the guest room, (mistranslated “stable”) that would have been on the upper level of the house where people slept, so they likely bedded down in the general living area on the first floor. A common practice then was to bring animals inside at night to protect them from cold, thieves and other dangers. That may be why Mary, after delivering her baby, lay him in a feeding trough (manager), that then served as Jesus’ bassinet.
Of greater importance is understanding why Jesus would be born in such lowly circumstances. Jesus was with God when the universe was created. He was the instrument of creation of everything, including mankind, with whom he wanted to have a relationship, and on whom he could bestow his love and affection. But man abused the relationship and rebelled and in the process became lost to God’s companionship and his love. God never stopped loving man, and prescribed a system of sacrifice by which man could atone for his rebellion, generally known as sin. The blood of an unblemished lamb was let each year for the forgiveness of sin, but it was a temporary measure that had to be performed annually, forever.
Jesus, the creator of the universe, came to earth to take the place of the lamb, shedding his blood once for all time. How better for Him to become the perfect sacrifice than to be born in the lowliest of conditions taking the place of the unblemished lamb. God loved us so much that he sent Jesus in total humility to provide a pathway for the restoration of our relationship with Him.