Abstinence - Ok, I will mention it. Abstinence wasn't practical for me as a teen mother because I stayed involved with the father for three years following the birth of my daughter, from 17-20. I realize that once a sexual relationship has started and especially after a child has been born, it is very difficult to stop it. I do think that in situations where the relationship has dissolved, there is no reason to jump right back out there. Just because you had sex as a teen and had a baby as a teen doesn't mean that you have to continue having sex. If you are not involved with your baby's father anymore, it might be a good time to take stock of your situation and be by yourself for awhile. You can use abstinence for a period of time to get yourself together without the complications a new sexual relationship can bring, on top of having a baby.
Condoms and other barrier methods - When used properly and with consistency, condoms are very good for preventing pregnancy as well as veneral disease. Out of every 100 women whose partners use condoms correctly and each time they have sex, only 2 will become pregnant. It is also a very cheap method of birth control. A box of 10-12 condoms runs about six dollars. If your partner is hesitant or you yourself are some-timey about condom use 100% of the time, you should also use another form of birth control. Other forms of barrier birth control are the diaphragm, cervical caps, and the female condom. The diaphragm and cervical caps work by covering the cervix, which blocks the opening to the uterus. Not very effective because with perfect use, 40 out of 100 women who have had a baby before will become pregant within the first year of use. Unless you have an allergy to latex, condoms have no harmful side effects.