In brief — the direct answer
Pregnancy at age 35 or older is associated with increasing chances of chromosome conditions and some maternal and placental complications. Most women in this age group have healthy pregnancies. Care should reflect your age at delivery, medical history and preferences; screening and diagnostic options should be offered through informed choice, rather than age alone.
What is Pregnancy at Age 35 and Older?
Advanced Maternal Age (AMA) is typically defined as age 35 or older at the time of delivery. The primary medical consideration is that as eggs age, they are more likely to have errors in chromosomal division (leading to conditions like Down Syndrome). Additionally, the body's vascular system may be slightly less resilient than in a woman's 20s, making it more prone to gestational hypertension and diabetes.
Who is at risk?
Pregnancy over 35/40 is associated with a higher incidence of:
- Chromosomal Aneuploidy: Such as Trisomy 21 (Down Syndrome), 18, and 13.
- Gestational Diabetes: Increased risk of insulin resistance.
- Pre-eclampsia: Higher baseline risk for blood pressure issues.
- Fetal Growth Restriction: Sometimes related to placental efficiency over time.
- Multiple Pregnancies: Women in their late 30s are actually more likely to release more than one egg naturally, or may be using assisted reproductive technology (IVF).
How we diagnose it
Prenatal screening and diagnostic options should be offered according to informed choice rather than age alone:
- NIPT (Non-Invasive Prenatal Testing): A high-performance screening option from 10 completed weeks. It is not diagnostic, and performance varies by condition and laboratory.
- Detailed Early Anatomy Scan: A thorough check at 12–13 weeks for physical markers and structural concerns.
- Uterine Artery Doppler: Part of first-trimester assessment for placental function and pre-eclampsia risk when clinically appropriate.
- Diagnostic testing: CVS or amniocentesis may be chosen after counselling when diagnostic information is wanted.
What does management involve?
Care is individualised. Discuss prenatal screening and diagnostic options, blood pressure and diabetes assessment, and whether third-trimester growth surveillance is indicated. Aspirin is prescribed according to the overall pre-eclampsia risk and contraindications, not age alone. For well-dated pregnancies with anticipated delivery at age 40 or older, guidance supports discussing planned birth during the 39th week; complications may change that plan.
What are the outcomes?
The outlook depends on the individual pregnancy rather than age alone. Screening can estimate selected risks, and diagnostic testing can answer defined questions; neither prevents or excludes every complication. Regular follow-up and prompt assessment of symptoms support care. Discuss future pregnancy planning, including any medical conditions or complications in this pregnancy.
When to see a subspecialist
Discuss preconception care or early antenatal assessment with your maternity team. An MFM consultation can help when there are additional medical conditions, a fetal finding, an abnormal screen, or questions about testing or surveillance. Age alone does not determine which tests you must accept.