How can i conceive twins?

Fertiltiy treatment: Fertility treatment accounts for about half of twins today.

Cross your fingers: The frequency of natural twinning is between 1-2%. Use of fertility medications can increase that chance to as high as 25%, but its considered medically inappropriate to administer fertility medicines purely for the purpose of conceiving multiples.

Get lucky: Twins occur roughly 2 out of 100 pregnancies. There is nothing you can 'do' naturally to change that. Fertility medicines give a higher chance of twins, but not a guarantee.

One is safer than 2.: Humans normally have one baby at a time. Having twins is not exactly normal, and carries added risks to the babies and the woman, on top of the risks already faced in a normal one-baby pregnancy. Risks include: premature birth (bad), twin-to-twin transfusion (bad), tangled cords (bad); higher chances of pregnancy hypertension, miscarriage, pregnancy anemia; C-section surgical delivery, etc...