Husband can't cum with a condom on! HELP!

I'm 5 months PP and we decided on using condoms for contraception because I don't like taking the pill (forgetful and don't like the idea of all the side effects).

Husband can't seem to cum with a condom on. We have tried a few different positions in bed and no matter how nice it feels for him he can't seem to orgasm. I've decided to bite the bullet and have an appointment about different types of contraception that I might be okay with having but ideally I would rather stay with condoms.

Just wanted advice on how I can get him to orgasm? Or do I just need to try a different type of contraception?