How do you adopt a child on sim's 3?

Answer 1

Click on the phone click on:

Call Services>

After loading a bit a screen will come up, it will list heaps of different services, some of them will be free some of them for a small amount of money.
Adoption is of course free. So next you click on:

Adoption Service

Then it will say "You want too adopt a child? That's great! We'll send you a adoption worker straight way" (Or something close too that) You have too be a young adult and older too adopt a child. If you're any younger someone will say "Your too young too adopt a child". If it allows you too adopt soon it will show you a notice asking you which age you'd like too adopt, feel free too pick out of

Baby, Toddler and Child.

Next is gender, it'll say both options

Male and Female.

There you have your new proudly adopted child.

Answer 2

If you are on a PC then you call for services on the phone and Child Adoption. Hope this is helpful! =P