Kinda postpartum too

So both my current partner and I had children with our exes. When mentioning of after the birth sex, he is insistent on having sex 3-4 weeks postpartum as he did with his ex, where I am comfortable with 6-8 weeks after as I did with my last pregnancy so I’m back on birth control. I do not want another. He is being kinda disrespectful of this and is commenting things like “well I hope your mouth works then” and I’m kinda hurt and feel disrespected and I don’t really know what to do because my last experience was different.