Secondary infertility: when the second child does not come

Fertility is not a fixed state; it changes with time. The most common cause of secondary infertility is simply that years have passed: the woman is older, the ovarian reserve has fallen, and egg quality follows age. A woman who conceived easily at 29 may struggle at 36, not because something is 'broken', but because biology has changed. This applies to the partner too: sperm quality can also change with age and health.

Beyond age, something else may have changed. A birth with complications, a curettage, an infection, surgery on the abdomen or pelvis, adhesions after a caesarean section, endometriosis that developed later, new fibroids or polyps, changes in weight or thyroid — all can play a part. Sometimes the factor is on the partner's side, even if the first child came without difficulty.

Couples with secondary infertility often come later than others. They are busy with the first child, they are told not to worry, and they feel guilty for worrying when they already have a child. This long wait is the main problem, because the most important factor, age, does not wait. Every year that passes lowers the chance, and a delayed assessment means fewer options.

The time limits for seeking help are the same as for primary infertility: after 12 months of regular trying, or after 6 months if the woman is over 35. Having a child does not extend these limits. If there is also a history suggesting a problem, such as irregular cycles, a previous operation or an infection, the assessment can start even earlier.

The assessment of secondary infertility is essentially the same as for primary infertility, and includes both partners from the start. In the woman, the ovarian reserve is checked with AMH and ultrasound, along with ovulation, the tubes, especially if there has been an infection or surgery, and the cavity of the womb for adhesions, polyps or fibroids. In the partner, a semen analysis is done, regardless of the first child having come without difficulty.

The history of the first pregnancy and birth takes on particular importance: how it ended, whether there were complications, whether there was a curettage or infection after birth. Often these very details show where to look. In some cases no clear cause is found, and then age and time become the main guide to the plan.

Treatment depends on the cause and on age. If a fixable problem is found, such as a polyp or adhesions, it is treated. If ovulation is irregular, it can be helped. If the main factor is age and reserve, time becomes decisive and IVF may be the most reasonable route earlier than it would be in a younger woman.

The emotional side deserves attention. Many couples with secondary infertility feel isolated, because they 'fit' neither with those who have no children nor with those who have them easily. Your concern is legitimate, and seeking help is not ingratitude for the child you have. A calm conversation with a specialist, in good time, is the simplest and most valuable step.