The horror incident occurred on Wattville Road at around 1pm on Friday. Police were quick to close off the scene, and confirmed the tot sustained severe bruises.
The baby was then checked for further injuries.
A police spokeswoman told BirminghamLive: “An 18-month-old boy has been taken to hospital after falling from a first floor window at a property in Wattville Road, Birmingham around 1pm today.
“The child has been left bruised, and is now being checked for any further injuries.
“We have cordoned off the property while we investigate the circumstances of the fall.”