There are so many programs that do help "normal" families who don't have trouble getting pregnant.
There is medicaid which pays for medical bills.
There are many food banks which give food to families that need it.
MANY companies offer paid maternity leave, and extend extra time off unpaid if the mother chooses to stay at home for a while.
MANY companies offer daycare programs for help with all kids, whether adopted or not.
The government has made provisions for the family medical leave act, which works for families, and keeps jobs open and father's ability to be at the birthing and first few days to take care of his partner during the baby's birth.
There are many housing assistance programs to help families.
In many, (not all!) cases, adoptive parents have to go through home studies, inspections medical tests, and have to prove they can support the child, have no history of abuse, and more, and adoption fees are typically upwards of $20,000.00 although some are cheaper.
In the case of impoverished people getting pregnant, why didn't they use birth control, and prevent my tax dollars from taking on another burden. I've seen so many people in our city's low income housing that just SCREAMS drug use, with their fancier than mine cars, their stereos louder than mine (I'm a pro DJ), and their hairdos with more treatments and better haircuts than I spend on myself, and with 5 kids.
I'm a middle class person, who doesn't get help with medical, although I have insurance. My other half couldn't take the day off without getting points against him at his job because we were adopting and wasn't allowed. The adoption grants and so forth are usually for families to adopt kids who might otherwise never get a permanent home. It might be that the child is a little older, and has just lost that cute baby look (not a good reason in my book, but it happens), kids may have serious problems with drug abuse during pregnancy, and there are often many appointments, court dates, etc, to adopt a child, where a natural child's mother goes to prenatal visits, and to the hospital to have the baby.
There are programs to help those that need it. I've seen elderly who have lower income get more help than a man who gets $1100.00 because the person who has the lower income also gets food stamps, free medical, free hearing aids, glasses, dental, rent, and more. All in all, the person who makes less, actually has more available spending money than the person who made $1100.00 a month, because that person spends their money on food, medical, hearing aids, glasses, dental, rent/mortgage/insurance/taxes, etc. This also is true for people who get welfare.