That's why it's important for both the man and woman to have a complete infertility workup as soon as they feel they're having trouble conceiving," advised Dr Robertson.
For couples who have conceived a first child with ease, it may be very emotionally distressing having difficulty conceiving the second or subsequent baby.
A few babies from women aged 40 doesn't mean the chances of those over 40 conceiving
are any higher.
Many couples of below average, but still normal fertility had problems conceiving
in the first year.
Then women below 30 had only a 23 per cent chance of conceiving
with these treatments.
It found that poor oral health is as bad for fertility as obesity - delaying the chances of conceiving by about two months.
"Until now, there have been no published studies that investigate whether gum disease can affect a woman's chance of conceiving, so this is the first report to suggest that gum disease might be one of several factors that could be modified to improve the chances of a pregnancy," said Roger Hart, who is Professor of Reproductive Medicine at the University of Western Australia (Perth, Australia) and Medical Director of Fertility Specialists of Western Australia.
Nearly hall had a normal weight before conceiving
, and 82% did not smoke in late pregnancy.
The odds of conceiving
in up to six months of trying decrease by two per cent for ever year a man is older than 24, according to the study.
A Danish study showed those who have just five drinks a week halve their chances of conceiving
Women in Brighton fall pregnant the fastest - with many conceiving
in the first month of trying, but they have fewer pregnancies than other top ten towns.
Although it's always beneficial to exercise in moderation, working out intensively could actually have a detrimental effect on a woman's chances of conceiving
During interviews in 2002, when they were aged 15-22, six women reported having had multiple partners; two said they had had a sexually transmitted disease before conceiving
. While five reported always discussing HIV with partners, only two said they used condoms consistently.
Most women have around a 20 per cent chance of conceiving
in any one ovulation cycle.
He said: "If patients pay attention to the timing of their cycle their chances of conceiving
the sex they'd like can be as high as two in three."