Girls born unexpectedly small or underweight seem to be twice as likely to have fertility problems in adulthood as those of normal size at birth, suggests research published in the online only journal BMJ Open.
Medical advances mean that more underweight and very small babies will survive into adulthood, which might therefore increase the prevalence of fertility problems, say the authors.
But as this is the first research of its kind, further studies will be needed before definitive conclusions can be drawn, they caution.