"This work adds to the evidence that fish is an important part of the human diet and reinforces the recommendation that pregnant women should include at least two servings of fish a week.  Including oily fish is a good habit to encourage."

Maternal fish intake in late pregnancy and the frequency of low birth weight and intrauterine growth retardation in a cohort of British infants   Journal of Epidemiology and Community Health Volume 58 Issue 6. I Rogers, P Emmett, A Ness, J Golding, ALSPAC Study Team.

The Food Standards Agency advises pregnant women and prospective mothers to avoid eating shark, marlin and swordfish because they contain relatively higher levels of mercury. They may also need to limit the amount of tuna they eat.

Small-for-dates takes into account the baby's size in relation to time spent in the womb.