CARSEAT QUESTION

Gabby • Engaged to the love of my life, and mommy to Elias Joseph 9.2.16💙
Okay, my fiancé's coworker who previously lived in Canada gave us her really nice basically new carseat and i love it. But when I was inspecting it yesterday I noticed that it was a Canadian carseat. Am I not able to legally use it in the US? I'm not sure about the laws. Im a FTM.