It is increasingly unlikely (at this point, the odds are astronomically remote) that I will ever have children now, as I near 40 and am still, materially, utterly unable to even think about supporting a child - I can't even adequately support myself. Sad. I always wanted to be a mom.
Ava's son is adopted (the only avenue that will be open to me, well, anytime now) and he was introduced into the story 1) because I wanted him to be and 2) because I wanted to think of a way to mature Ava some; a child, especially one with a myriad of special needs, which he has, is a good way to move her forward, from young, impulsive, mad Ava, on to the older, calmer, wiser Ava she has to become someday.
Also, kids are awesome.