Why do you draw the line at two children? You might as well say that one is enough – or that it is irresponsible to father any children at all. In this issue, the different views collide with each other, and as long as no actual damage is present, it is difficult to designate one of them as wrong.
In the case of a relationship in which both partners suffer and no respect more for each other, it is obvious that the continue to make stupid. Your friend, however, you have to, as long as he does not let his children not abused or neglected, probably easy to make, even if they understand it. Especially since children are always a sensitive issue – even in the not even begotten condition: mothers of single children are constantly asked when this would for a sibling. You give the answer, such was not planned, they are looked at wrong.
Ultimately, have children and have to be a private matter, the stops are only private if the family network is so destructive that the child is at risk. The question is less how many children is allowed to have her boyfriend in a sensible way, but rather, whether he is generally good, so loving, patient, supportive and present father. There are people who would have been better had no children. Many others are overwhelmed with the second so that they run only at the Limit, and only by shouting to communicate. And finally, there are parents who are not also of five children from the rest. Hold your friend so only from the reproduction, if you are convinced that he is aggravated to an already problematic Situation. Only then it is your duty to criticize him.