During the second trimester, a pregnant woman needs an additional kcal per day.

I believe that during the second trimester, a pregnant woman need an additional 350 kcal per day.  Dietary intake during pregnancy must provide energy that will ensure the full term delivery of a healthy newborn baby of adequate size and appropriate body composition. A pregnant women requires additional energy for the fetus and that explains the reason for the additional energy requirement. 

This is the most closely resembles the model. 

This movement is also referred to as  glacial plucking