Secondary Infertility: Trouble Conceiving After a Previous Child
Key takeaways
- Secondary infertility means struggling to conceive (or carry to term) after having one or more children before; it is common and just as real as primary infertility.
- The same causes apply as for any fertility problem: age, ovulation and tubal issues, endometriosis, sperm changes, and often something unexplained; circumstances can change between pregnancies.
- The standard advice still holds: see your GP or fertility team after about a year of trying, or after six months if you are over 35, because age is the strongest single factor.
- Many people feel they have no right to be upset because they already have a child; that grief is valid, and support is available.
Secondary infertility is difficulty getting pregnant, or carrying a pregnancy to term, after you have already had one or more children. It is defined exactly like any fertility problem: not conceiving after about a year of regular unprotected sex, or six months if you are over 35. The previous birth is the only thing that sets it apart, and it is precisely that history which makes it so disorientating.
What secondary infertility means
Secondary infertility describes trouble conceiving again despite a previous birth, and it is just as real as never having conceived at all. The clinical threshold is the same: NICE and the NHS suggest seeking help after about twelve months of trying, or after six months from the age of 35. Conceiving easily before does not protect you, because your body, your age, and your circumstances rarely stay the same between pregnancies.
I want to be plain about one thing I felt and heard constantly: the sense that you have forfeited the right to be upset because you already have a child. You have not. The wish for another baby, and the months of negative tests, can hurt every bit as much the second time.
How common it is
Secondary infertility is common, not a rare exception. Infertility affects around one in seven couples in the UK, according to the NHS, and a large share of the people behind that figure already have a child. Difficulty after a first baby is one of the more frequent reasons people return to a fertility clinic, even when their first pregnancy happened quickly and without help.
Why it happens
The causes of secondary infertility are the same as for any fertility difficulty, because the biology does not change just because you have given birth before. The main factors to know are these.
Age and egg supply
Age is the strongest single factor in fertility. Both the number and quality of eggs decline with age, more steeply from the late 30s, which matters because a second attempt often comes several years after the first. We go into this in age and fertility.
Ovulation, tubes and conditions
Ovulation can become less regular over time, and conditions such as PCOS or endometriosis can develop or worsen between pregnancies. The fallopian tubes can be blocked or damaged, sometimes by infection or by scarring after a previous delivery. See causes of infertility for the full picture across both partners.
Sperm and male factors
Sperm quality is not fixed. Count, movement, and shape can change with age, weight, illness, and lifestyle, and male factors contribute to roughly half of all fertility problems. That is why guidelines recommend testing both partners, not just the one who carried before.
When no cause is found
In a meaningful proportion of couples, investigations find nothing clearly wrong; this is called unexplained infertility, and it is no less frustrating for the lack of an answer.
What to do next
The single most important step is not to wait longer than the guidelines suggest. See your GP or fertility team after about a year of trying, or after six months if you are over 35 or already know of an issue such as irregular periods. Fertility is time-sensitive, and a previous easy pregnancy is not a reason to delay; if anything, the years that have passed are part of the picture. Read when to see a doctor about fertility for what to expect at that first appointment.
Investigations usually start with tests for both partners to look for a cause; you can read about these in fertility tests and investigations. Treatment then follows the cause, and previous success does not rule it out.
Looking after yourself
The emotional weight of secondary infertility is often underestimated, including by the person living it. You may feel guilt for wanting more when others have none, grief that your child may not have a sibling, and a quiet loneliness because the world assumes a second baby will simply follow the first. None of those feelings is wrong. Specialist fertility counselling is widely available through clinics, and charities such as Fertility Network UK offer support; our guide to coping with the emotional side of fertility treatment may help too.
This is general information and support, not medical advice. For guidance on your own situation, please speak to your GP or a fertility specialist.
References
- Infertility: Overview, NHS.
- Causes of infertility, NHS.
- Fertility problems: assessment and treatment (NICE guideline CG156), National Institute for Health and Care Excellence (NICE).
- Secondary infertility, American Society for Reproductive Medicine (ReproductiveFacts.org).
Frequently asked questions
What is secondary infertility?
Secondary infertility is difficulty getting pregnant or carrying a pregnancy to term after you have already had at least one child. It is defined the same way as primary infertility: not conceiving after about a year of regular unprotected sex, or six months if you are over 35. The only difference is that it follows a previous birth, which is why it can come as such a shock.
Is secondary infertility common?
Yes. Infertility affects roughly one in seven couples in the UK, and a substantial share of those already have a child. Having conceived easily before is no guarantee it will happen again, because age, health, and circumstances all change between pregnancies.
What causes secondary infertility?
The causes are the same as for any fertility difficulty: increasing age and a natural decline in egg numbers, problems with ovulation, blocked or damaged fallopian tubes, conditions such as endometriosis or PCOS, changes in sperm quality, and complications or scarring from a previous birth. In a notable proportion of cases no clear cause is found, which is called unexplained infertility.
When should I see a doctor about secondary infertility?
See your GP or a fertility specialist if you have been trying for about a year without success, or after six months if you are over 35 or have a known issue such as irregular periods or endometriosis. Do not wait longer just because you conceived easily last time; age is time-sensitive, and earlier investigation gives you more options.
Can secondary infertility be treated?
Often, yes. Treatment depends on the cause and can range from medication to help ovulation, to IUI, to IVF or ICSI. Tests for both partners come first to find the reason. Your fertility team will explain what fits your situation, and previous success does not rule treatment out.
Why does secondary infertility feel so isolating?
Many people feel they cannot grieve a longed-for second child when they already have one, and others may dismiss the pain for the same reason. The difficulty is real and the feelings are valid. Charities such as Fertility Network UK and counselling through your clinic can help, and you are far from alone.
Written by Emma Lawson. Medically reviewed by Dr Priya Nair, MBBS, MRCOG.
Our guides are written from personal experience and reviewed by a qualified clinician for accuracy. Read our editorial policy.