A source tells People of Sandra's life as a single parent in this week's cover story. "Being a mom is her total focus now… Louis has become her whole life."
"She is raising Louis as a single mom, and she never thought it would be this way," says another Bullock source. "She's still trying to figure out [her new life]."
The Oscar winner is regularly seen shuttling between work at her Fortis Films production office and her son's preschool. The two were also recently seen at a meet-and-greet with Thomas the Tank Engine at Fillmore Central Park in California.
For more on Sandra and Louis, pick up this week's People magazine, on newsstands Friday.
After her split from two-timing tatted biker Jesse James in 2010, actress Sandra Bullock adopted a baby boy, Louis, and the two have been inseparable since.