Before-birth climatologic data may play a role in the development of allergies in infants
Quite a forward thinking research study. The researchers looked at whether the season of birth correlated with whether or not the child had allergies by 12 months of age. Spring and summer births fared the best, with the infants being born with 3 months of sunshine topping the list. Given how important vitamin D is for a well balanced immune system, this should come as no surprise.
The bottom line is that pregnant women should supplement with relatively high levels of vitamin D in the last trimester or spend some good solid time in the sunshine.