When Marty was telling that her mom was going to have more babies, she says, "Get this! 7!" (Don't panick, it's just a show.) Anyway, she held up 6 fingers instead of seven!
Actually she did hold up seven fingers.She held up five on one hand and two in an"L" shape on the other. Trust me I 've seen the movie about ten times and I have it on tape and just went back and watched it.
I don't know what movie your watching, but Quints (First shown August 2000 on the Disney Channel) has has no one named "Marty" in it. Jamie Grover is played by Kimberly Brown who also played MARNIE on Disney's Halloweentown and Halloweentown II. Better straighten out your movies.
P.S. It's not "panick" its panic