What should I do ?

Okay So I’m starting off here , I left my daughters dad when I was 6 months pregnant . He was there when she was born & my daughter has his last name . he stopped buying this for her because me & him were no longer in a relationship. She is now 3 years old & he only sees her Saturday night & she sleeps over & I pick her up Sunday afternoon. His mom says that he’s always annoyingly bragging about buying his own daughter a little bag of winnies so she can eat with eggs . Point is he doesn’t give me any money for her , neither helps me out in expenses such as clothes , shoes , he just baby sits her for the Saturday night & Sunday . He always complains about buying my daughter the diapers huggies . The other brand of diapers gives my daughter a very bad diaper rash .

He says they are to expensive & a bunch of bs . That he wants to save money . But literally all he does is buy her diapers . He doesn’t help me financially.

What do you guys think I should do ?