No one is sure why identical twins occur, but a dominant maternal gene may cause a single fertilized egg to split. Fraternal (dizygotic) twins are easier to explain because they tend to run in families or occur when fertility treatment boosts the number of eggs released or when two or more fertilized eggs are returned to the uterus during IVF (see page 45). Th w t o x w m m k o m ve a at w o w m y o y ve wh o b wo w w o g e y a t o r m by.
Th e t mu g be more difficult, and put you into the category of a " hi gh risk " pregn ancy. In the first trimester, o m o l e wh t m y m m w l such as morning sickness, will be exacerbated w w . w o pren at al c are , your b abie s will thrive.
Many women, especially those who have had IVF, e ke y e x m e by. Yo m y ve vat ve m o
( HCG)—the hormone detectable in a pregnant
woman's blood or urine about 10 days after conception . An ultrasound scan will confirm that o x w m . wo wo it' s twins! If it can also be seen that they are of a e x o w w at at m g
EXPECTING MORE THAN ONE
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A Beginner's Guide to Healthy Pregnancy. If you suspect, or know, that you are pregnant, we ho pe you have already visited your doctor. Presuming that you have confirmed your suspicions and that this is your first child, or that you wish to take better care of yourself d uring pregnancy than you did during your other pregnancies; you have come to the right place.