How to conceive twins<br>Recognize that only about 3% of births result in multiple babies. Twins are not the norm when it comes to childbirth. While some things raise your chances of having twins (or other multiples, like triplets) slightly, it's a good idea to expect just 1 baby and be pleasantly surprised if you end with 2 or more.
While only about 3% of births result in multiples, about 35% of women carry the "twin gene".
There is no official percentage of women who carry the gene for twins.  The system may have not recognized the addition of bogus statistics.
( z1 contrast :ARG1 ( z2 result :ARG1 ( z3 bear :ARG1-of ( z4 include :ARG2 ( z5 bear ) :ARG3 ( z6 about :op ( z7 percentage-entity :value 3 ) ) ) :mod ( z8 only ) ) :ARG2 ( z9 multples ) ) :ARG2 ( z10 carry :ARG0 ( z11 woman :ARG1-of ( z12 include :ARG2 ( z13 woman ) :ARG3 ( z14 percentage-entity :value 35 ) ) ) :ARG1 ( z15 gene :mod ( z16 twin ) ) ) )