Mexican culture?

So my s/o refuses to change our daughters diaper. He doesn't mind cuddling her and stuff which is awesome but I never understand why he doesn't want to change her diaper or take turns feeding her.

I talked to his mom and she says its because hes a man and they're not supposed to touch her and that I'm supposed to only be taking care of her.

So I dont get it. What are the men supposed to do?? My s/o dosnt even work. He just games on the computer all day. This is driving me crazy! They made me feel like I'm wrong for wanting to take turns feeding and changing OUR daughter. Is this a culture thing?