Hindi pa talaga, mama, ang doctors usually recommend waiting until baby is around 6 months and fully on solids before introducing fish, at least one year para sa tuna dahil may mercury concern. Better to check with your pediatrician kung kailan exactly ang best time para sa baby mo, pero most of my mum friends waited until around 1-2 years before giving tuna to be safe, kasi some babies can have allergies pa rin. If baby is already on solids and your doc says okay na, make sure it's the low-mercury kind at well-cooked talaga, no raw tuna para sa babies!