"how do i put my baby's daddy on child support"

The US Department of Health and Human Services has an Office of Child Support Enforcement.  By Federal Law each state must provide either free, or inexpensive (a sliding scale depending upon how much money you make) assistance to obtain child support from absent parents.  Go to this website:

http://www.acf.hhs.gov/programs/cse/extinf.html

There is a map of each state in the US.  Point your mouse pointer on the state you live in and click.  The website for the agency that handles child support enforcement for your state will pop up.  If there are a lot of different agencies listed, find the Child Support link and click on it.  This should give you enough information to tell you where your closest office is, and the times they are open and if you need to make an appointment or not.  There may be a telephone number to call.  It is different in each state.  Sometimes it will be a county office that handles these cases.  You will get help filing a claim for any money you have coming to you, and any other things you may have to do.

This is the website for the US Government Office, which also has valuable information about what services are available and where to get them:  http://www.acf.hhs.gov/programs/cse/

There are also private companies and lawyers who do this sort of work, but they will cost much more than the state agency.

I hope I have helped you.