When I think back to that time, I recall an almost constant sense of grief. Every 28th day represented another failure, another loss. All around me my friends were having their second and then third babies. My son looked at his classmates with their siblings wistfully, he wished with every birthday candle for a brother or sister and one day he asked, "Can you play tig on your own?"
Sometimes problems getting pregnant for a second or subsequent time are related to a complication that occurred in a prior pregnancy or prior to delivery (damage to the uterus, for instance). But most often, secondary infertility is caused by the same factors that would cause primary infertility — issues like advanced age, obesity, ovulation problems and so on.