Woodward, who was an au pair with the family of eight-month-old Matthew Eappen, now faces being jailed for life with no parole for at least 15 years.

The jury reached its decision after more than 26 hours of deliberation and several requests to the judge for clarification of evidence.

Woodward, who broke down in tears as the verdict was delivered, has always denied killing the boy.

The prosecution argued that on 4 February, she battered and shook baby Matthew to death in a rage of frustration because she was unhappy with her job and the baby had been crying.

After the verdict the court was immediately adjourned until tomorrow when sentencing will be passed.

Prosecution lawyer Martha Coakley said: "We had common sense and we had truth on our side."

She also added that the Eappen family were "relieved it was over and had just wanted to know what happened to their child".