YOU SAID:

I have a watermelon growing in my bellybutton.

INTO JAPANESE

私のお腹にはスイカが生えています。

BACK INTO ENGLISH

I have a watermelon growing in my stomach.

INTO JAPANESE

お腹にスイカが生えています。

BACK INTO ENGLISH

There is a watermelon growing in my stomach.

INTO JAPANESE

お腹にスイカが生えている。

BACK INTO ENGLISH

There is a watermelon growing in my stomach.