No. In Jain tradition, Mahavir Swami was not exchanged with a girl child.

According to the accepted Jain account, Bhagwan Mahavir was:

• born as Vardhaman to Kundalpur
• the son of King Siddharth and Queen Trishala
• a Tirthankar, whose birth was marked by auspicious signs

The story of being exchanged with a girl child is not part of authentic Jain tradition. It is likely a confusion with some other folk story or later legend.

If you want, I can also give the birth story of Bhagwan Mahavir in simple Jain form.