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no
Yes.
No, but it increases your chances of having a PLASTIC BABY.
Yes, iced tea can increase your chances of getting cavities. This is because tea contains acids and tannins that can erode tooth enamel and lead to decay if consumed frequently and not offset by good oral hygiene practices.
No it will not.
Yes; having a STD absolutely does increase your chances of contracting HIV.
Having sex closer to ovulation could increase your chances of having a boy.
no
No, but if you have twins in your family there is a good chance of twins but soy stuff does not increase or decrease your chance of having twins.
Despite what you may have heard, taking prenatal vitamins won't increase your chances of getting pregnant, but it will certainly increase your chances of having a healthy baby once you are pregnant. See the Related Links section below for more information.
having lots of intercourse on yor fertile days
There is an increase in the chance of for instance, Downs syndrome as the mother gets older.