@Chubbyxie,
He's being ridiculous and selfish.
Seriously. Adoption is a time-honored means of making a family. I understand there is a biological impulse at work here, but the circumstances require everyone to get practical.
If he is proposing you, some baby mama woman and a child, guess who's going to be the odd person out? Hint: it's not him, the baby mama, or the kid.