It is possible to breastfeed at the age of 18 if you are unmarried. After giving birth, due to the change of hormone level, the increase of prolactin will cause milk secretion, generally speaking, if the female friend does not have a combination of major diseases can be breastfeeding. If you suffer from severe hepatitis, thyroid dysfunction, etc., you can’t breastfeed. Whether or not you can breastfeed after giving birth has nothing to do with whether or not you are 18 years old or married. You can breastfeed as long as you have milk secretion after delivery and you are willing to breastfeed your baby. After giving birth, women must pay attention to rest more, appropriate nutrition, which is conducive to the promotion of milk secretion, and if there is breast swelling and pain, fever, etc. after giving birth, it is necessary to consult a doctor as soon as possible.