Yes, it is generally safe to drink soda while breastfeeding, but there are a few considerations. Soda often contains caffeine and sugar, which can affect both the nursing parent and the baby. It's recommended to limit caffeine intake to about 200-300 mg per day while breastfeeding, as caffeine passes into breast milk and can potentially make the baby restless or irritable. One can of cola typically contains about 40 mg of caffeine, so moderate consumption is usually fine. However, drinking large amounts of soda with high sugar content is not advisable, as excessive sugar consumption can affect both the parent's and baby's health. It is also best to avoid soda with caffeine later in the day to prevent sleep disturbances for both mother and baby.

In summary, soda can be consumed in moderation during breastfeeding, with attention to the caffeine and sugar content to avoid any potential negative effects on the baby.