Where I’m from 20 is a perfectly normal age to start having kids. I had my first at 20, he will be fine.
Tell us where you are from and we'll be the judge of that.
Also, define 'fine.' Fine is alive, reasonably healthy, functioning, housed, not starving and not hugely dysfunctional. 'Fine' isn't necessarily happy, fulfilled, successful, self sufficient.
Personally I want my children to aspire to a bit more than 'fine.' I want them to have choices and the opportunities to create whatever future for themselves they are prepared to work to achieve. Becoming a parent and a step parent at 20 doesn't feature anywhere in that scenario.
Condoms are available. Men can already take FULL responsibility.
How many people in long term relationships carry on using condoms even when the woman says she takes the pill/has the DEPO? Hardly any. Just as many men are happy and relieved to ditch condoms so are many women. Besides, if threads on MN are anything to go by, condoms have a HUGE failure rate.
I'm talking about a proper male BC method that is not dependent on the mood in the moment. Like an injection or a temporary and easily reversible vasectomy or a male pill. None will be completely infallible but will certainly be more reliable than condoms.
That would remove the whole 'we don't need condoms, we are in a monogamous relationship and she's on the pill' argument, which all too often leads to blame and recriminations when an unplanned PG occurs and the inevitable arguments when one wants to keep the pregnancy and one doesn't.