I hate to say it but I know
heather, meghan, haley, brandi, and shelly are 5 girls I know for sure that aren't with their baby's father. These girls are 18, 18, 17, 17, 15.
It seems like your point is right.... Guys mature slower and aren't ready for this type of situation! It's sad though, these poor girls have to raise their kids alone, although, in some of the girls cases its prolly better that the father isn't there!
Love,
chanda