Selfish husband

Since having our son I swear my husband has become more lazy and selfish, when it was just us he was fine but now he's just horrible and completely lacks responsibility. We have open communication and I've told him time and time again to start pulling his own weight and it works for about a few hours then he stops again. I love him but and he's a great husband but a horrible father 🙄. I can't even remember the last time he has helped buy diapers or anything for the baby. I'm just feeling overwhelmed because all of the responsibility is falling on me and I'm just getting burnt out. 😒 I'm also hoping just venting about it will make me feel a little less stressed.