Babies cry, especially during the first few months of their lives. It is their way of communicating. Whether they are hungry or lonely or have a full diaper, crying is how they let us know that they need us.
Some are also plagued by gas in their tummy, which is painful and upsets them. Others suffer from reflux and spit up a lot.
Livi did not have an easy start in that regard. As a high need baby, she already cried a lot more than other babies. But she was also unfortunate enough to struggle with a gassy tummy and reflux. Both seemed to upset her more than other babies and perhaps this was also due to her high need nature, I am not sure.