17.04.2014

Percentage pregnancy over 35

Having made the exciting decision to start your own family you are sure to be wondering how long it will take to get pregnant. You may find it encouraging knowing that the number of women over the age of 30 having babies has risen in recent decades (ONS 2010) . Most women will be able to conceive naturally and give birth to a healthy baby if they get pregnant at 35 years old.
This over-production of FSH can result in more than one follicle ripening and releasing an egg. Over 80 per cent of couples will conceive within a year if they stop using contraception and have regular sex (CKS 2007, NCCWCH 2013:64).
About half of the women who don't get pregnant in the first year conceive during the following year, giving a pregnancy rate of 92 per cent within two years. Age aside, there are some steps you can take to give yourself the best possible chance of conceiving and having a healthy pregnancy. Learn more about getting pregnant in your 20s, 30s or 40s, or get tips, advice and support in our friendly community of mums and mums-to-be. Join now to receive free weekly newsletters tracking your baby’s development and yours throughout your pregnancy.
The ability to become pregnant begins to decrease starting at age 32 and decreases more rapidly after age 37. Older women are also at greater risk of acquiring medical conditions like endometriosis, pelvic infections, polyps, obesity and fibroids that can lower the chance of becoming pregnant.


Women over 35 have a higher risk of miscarriage once they become pregnant compared to younger women. An ectopic pregnancy occurs when the embryo implants in the fallopian tubes instead of the uterus.
Older women are more likely to have pre-existing medical problems before getting pregnant such as high blood pressure, heart disease, kidney disease and obesity.
The most common chromosome abnormalities associated with maternal age over 35 are Down syndrome, Edwards syndrome and Patau syndrome.
Several studies show that patients over age 35 have a higher risk of preterm birth and low birth weight. For some women having a multiple pregnancy brings them their dream family in one pregnancy. But if you are over 35, and finding that positive pregnancy test elusive, it is important to seek help sooner rather than later (NCCWCH 2013:6). The good news is that most patients getting pregnant after age 35 do well and have healthy babies. Women 35 and older are at an increased risk of ectopic pregnancy compared to younger women because they have had more time to develop pelvic infections and scar tissue in the tubes.
Because of this, women having babies after age 35 are at higher risk of preeclampsia, gestational diabetes and complications during the pregnancy.
Only a few pregnancies carrying an extra or missing chromosome will go to term with most resulting in a miscarriage in the first trimester.


Fertility medications have also been associated with an increased risk of a multiple pregnancy. Boyle specializes in high risk pregnancy care including prenatal diagnosis, fetal therapy, amniocentesis, targeted ultrasounds, congenital birth defects, and twin & triplet pregnancies. As women grow older the likelihood of getting pregnant falls while the likelihood of infertility rises.
However, the success rates of IVF treatment for women over 40 using their own eggs are low, and have not increased much over the past decade (RCOG 2011). This could prevent fertilisation altogether or increase the likelihood of an ectopic pregnancy (CKS 2007, NCCWCH 2013:129, Utting and Bewley 2011). Diabetes in pregnancy is also associated with a higher chance of large babies and cesarean delivery. Interestingly, patients over 35 who are having twins have no more complications than younger patients.



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