http://articles.mercola.com/sites/articles/archive/2008/01/02/time-between-pregnancies.aspxSpacing pregnancies between 18 to 23 months apart results in the lowest risks for the infant. Researchers call this spacing the "optimal interpregnancy interval," noting that it is associated with lower risks of low birth weight and prematureenCommunityServer 2008.5 SP1 (Build: 31106.3070)