Delta Flight w/ baggage plus baby bouncer in box?

I was wondering how much they would charge me for bringing a baby bouncer that is still in it's box, plus my baggage. My grandma threw me a baby shower, while I was visiting my hometown of Dallas Tx, but now I'm going to head back to Atlanta Ga. where I am currently now living. This is the only big thing, that I cannot pack inside my baggage because the rest is baby clothes, shoes, socks etc. Please Help.