Condom Trouble? 👶🏽

AS
So my brother is really careless and got his gf pregnant. Now he is with some other chick and still isn't using protection. His reasoning is that condoms just don't work for him. Like after a couple minutes, his dick deflates when using a condom. Have any of your guys had this problem? What can I suggest him to do? I don't want him impregnating another girl.
( The girl taking birth control is not a solution I see because all the girls he is with are pretty manipulative and probably wouldn't follow through with birth control. )