It can be a confusing and heartbreaking time for patients who are experiencing problems falling pregnant with their second child when first time around it was relatively easy.


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The issue is often called “secondary infertility” and is defined as a couple that, despite having achieved a pregnancy in the past (which may or may not have resulted in the birth of a child), are unable to do so again after a year or more of regular unprotected intercourse.

While there are few official statistics of the prevalence of secondary infertility in Australia, it is thought that it affects 1 in 10 couples.

Sometimes an answer cannot be found for the cause of a couple’s secondary infertility, however, it is thought that the following are the most common factors affecting success:

Maternal age

Maternal age is a significant factor and often the most important indicator of a woman’s chance of conceiving.

Conception rates for normal healthy couples are, at best, 20-25 per cent per menstrual cycle.

Once a woman reaches the age of 35, her fertility begins to decline. By age 40, it is estimated that her conception rate is in the range of 8-10 per cent per month and at age 43, the pregnancy rate is thought to be as low as 1-3 per cent per month.

Female factor

Irregular menstrual cycles may suggest a problem with ovulation and result in difficulty conceiving.

The average length of the menstrual cycle is 28 days, but can range between 25 and 35 days. The female menstrual cycle is determined by a complex interaction of hormones, so any hormone imbalance can make your period irregular.

While in most cases irregular cycles are not dangerous, it is important to determine what is causing the irregularity.

Blocked fallopian tubes are more common in secondary than primary infertility. If the egg can’t meet the sperm normally due to a blockage, conception will be very difficult.

Male factor

Poor sperm function resulting in the man not having enough normal moving sperm per ejaculate can impact on conception.

Unfortunately, having a previous pregnancy is not proof that this is the case. Developing and transporting mature, healthy, functional sperm depends on a specific sequence of events occurring in the male reproductive tract.

Many disturbances can occur along that path, preventing cells from maturing into sperm or reaching the woman’s fallopian tube, where fertilisation occurs.


Weight is a common factor affecting fertility success. For women, ovulation can be negatively impacted on by being either underweight or overweight, and studies have shown that bringing BMI within the normal range can help ovulation occur normally, thus increasing chances of pregnancy.

It’s also very important for men to ensure a healthy BMI, and studies have consistently linked obesity to a lower sperm count among overweight men because testosterone levels drop while estrogen levels rise.

Unfortunately, it is estimated that roughly 10 per cent of infertility remains unexplained even after complete medical evaluation.

Have you experienced trouble conceiving your second child? 

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  • I am so thankful that I didnt have any issues at all falling pregnant. I really feel for those that have struggled.


  • Thank you for the informative article.


  • Me and my partner fell pregnant with twins within months of dating… i miscarriaged and in nearly 3 years havnt fallen pregnant again… i can only put it down to my weight i guess.


  • I know of a Mum who remarried (had one child by the 1st marriage) and had problems conceiving when she remarried about 6 years later. The Specialist discovered part of her uterus was out of position and was able to manouvre it under heavy sedation. She got pregnant not long afterwards.


  • We were very lucky that we got pregnant the first time we tried for both bubs 1 and 2. But I definitely feel for those couples that have difficulty.


  • I think it’s always hard when you want a child and it’s not successful but they say couples who had a child together have a great chance conceiving a second one, it just may take longer. We were fortunate enough to have 1,2,3 planned and very close and 4 was a lovely surprise.


  • yeah my heart goes out to anybody longing for a child. keep soldiering on! you will get there and i will pray for you all!


  • I think i fell pregnant the first time after baby number 1, eek.


  • Just go away on a holiday – guaranteed to conceive while you are out and having fun and not trying.


  • It’s just so different from one couple to the next that’s for sure.


  • It took us 4.5 years to get pregnant with our second so we have a 6 year gap between 1 & 2 and then only 2 months with our 3rd so a 18 month gap!


  • Lke hf


  • Yes I had blocked fallopian tubes,


  • I had a lot of problems getting pregnant with my first and only child. She was born with infertility treatment. It took me 4 years. I was lucky that it functioned. The 2 IVF’s we did after her, didn’t go well at all.


  • These couples are lucky to have one. Many find it hard to overcome infertility issues the first time around. Whether we have kids or not is not always a choice. We can choose however to be happy with our family circumstances, no matter what they may be.


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