After conception it takes about a week for a fetus to attach to the uterine wall, after which it starts drawing nutrients and oxygen from you. From this point on, what you put in your body starts to count, especially through the first three months while the fetus is forming.
A safe level of how much you can drink has yet to been determined by the experts, so most recommend abstaining all together. Heavy use during pregnancy can cause fetal alcohol syndrome, but that single glass of wine you had before you knew of your pregnancy won’t.
However, it has been proven that smoking and pregnancy don’t mix, so steer clear of smoking of any kind to prevent lower birth weight.
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