The 22-month old boy survived the fall on Christmas Day with bumps and bruises.
Authorities say his mother, Lupita Cortez, also was treated for broken bones in her feet after she jumped from the same window when officers arrived.
San Jose Police spokesman Sgt. Jason Dwyer said Monday that Cortez has a history of mental illness but he said he could not give details because of medical privacy laws.
In addition to attempted murder and child abuse, Cortez also was booked into Santa Clara County's main jail on suspicion of assault with a deadly weapon.