The 32 year-old star, who is married to Coldplay singer, Chris Martin, gave birth to their first child, Apple, last May.
Speaking to students at a London drama school, Gwyneth said: "I used to be excellent and then I had a baby and I can’t remember anything. I used to have a fantastic memory and now I can’t remember what day it is."
Even with this inconvenience, the star still mentioned that she would like to have another baby.
The actress has started working after spending the past year with her daughter. She is currently filming Running With Scissors with Annette Benning.