The first three Christmases all reference breast feeding! The first one the SIL says it doesn't hurt, the next house the sister is shown BFing a baby (probably 10ish months, too), and then at the next house the mom says that Vince Vaughn's character BF until he was 5 and she thought she was going to have to move in to his college dorn with him if he never weaned.
There were definitely jokes about BFing, but overall I think it was a fairly positive representation of BFing! I think I just notice things more now that I'm nursing.
Re: four christmases- BFing scenes