By the 1970's, amniocentesis had become available to women of advanced maternal age.

Association was found, for instance, between increasing maternal age and the frequency of Down's syndrome.

However, the maternal age, weight, ethnicity etc. are still included.

For those pregnancies that do continue, some 15 percent are lost before 20 weeks - and this figure increases with maternal age.

Indeed, it is worth remembering that the effect of birth order may vary with maternal age.

Maternal age and a birth weight of less than 2500g may also play a role in trigonocephaly.

Trisomy has been determined to be a function of maternal age.

Advanced maternal age increases the risk of a child being born with some disorders such as Down syndrome.

Though maternal age and birth order have an independent effect on the viability of the fetus, that act together.

It does not show the maternal age effect, and is just as likely to have come from fathers as mothers.

The risk of malformations seems to increase with maternal age (Nortman, 1974).

(For this reason, birth weight should be regressed on maternal age).

It is more likely with advanced maternal age.

Maternal age influences the chances of conceiving a baby with Down syndrome.

Maternal age - a woman's risk factor increases as she gets older (especially for women over 35 years of age).

But it is the first study to systematically examine the risk of 43 other common birth defects relative to maternal age.

Advancing maternal age and a patient history of previous spontaneous abortions are the two leading risk factors.

The average maternal age for conceiving a child with this disorder is 32 .

The incidence of placenta abruptio increases slightly with maternal age.

However, the presence in all races, the association with older maternal age, and the rarity of recurrence had been noticed.

Her child was born severely retarded because of Down syndrome, a birth defect related to maternal age.

A Norwegian study of 2001 found no association with paternal age after adjustment for maternal age.

Advanced maternal age causes decreased success rates in ovarian hyperstimulation.

Maternal age: pregnant women who are younger than 20 or older than 35 are at greater risk.