Can breastfeeding act as birth control after childbirth?

"Lactational Amenorrhea is a protection in the sense, that is if the lady is totally breast-feeding during the day and atleast 2 to 3 feeds at night, with no top up feeds and 6 months no menses, then it is protective. But it is little tricky in the sense that it offers good protection. So but it is upto maybe 90% or more. But you can still follow contraception. Maybe you can start after 3 months, if you are very confident and the other thing is that you will not get periods. When you are totally lactating or totally breast feeding the baby, then you may be in amenorrhea, that is not getting periods. So that means maybe you are protected for 6 months. Once again I am telling you, once the baby starts weaning or once the baby starts taking solid foods or starts taking the top up feeds, then the protection goes. So as you are going from the amenorrhea phase to the phase of menstruation, that small gap of period that you are not protected, then you can conceive. So Lactational Amenorrhea protects as long as you are totally breast feeding and no menses. Once the baby starts on other feeds, the protection is gone"