如果你想说一个女婴的英语特别好，你可以说：

"She is an exceptionally talented Engpsh speaker for a baby."

或者：

"She has a remarkable aptitude for Engpsh, especially considering her age."

此外，你也可以说：

"She has an advanced grasp of Engpsh for a baby."

"She is a prodigy when it comes to speaking Engpsh."

"She has an impressive command of the Engpsh language for a baby."

希望这些表达方式能帮到你！