 [ Symptoms ] my eldest daughter is suffering excruciating pain need second opinion [ Disease ] drinking diet soda in moderation should not be a problem although one study showed diet soda was associated with preterm delivery more studies are needed to confirm a relationship also remember soda has caffeine the march of dimes recommends 200mg or less daily for pregnancy women and a diet coke has 45 mg be sure not to skimp on water and other nutritious beverages such as milk