Yes you can give your baby sardine.
As regards how many times you can feed your baby, Continue frequent, on-demand breastfeeding, including night feeding for infants
✔ Introduce complementary foods beginning at six months of age
✔ Increase food quantity as the child ages–while maintaining frequent
breastfeeding
• Provide 6– 8-month-old infants approximately 200 kcal per day from
complementary foods.
• Provide 9– 11-month-old infants approximately 300 kcal per day from
complementary foods.
• Provide 12– 24-month-old children approximately 550 kcal per day from
complementary foods.
• Local research is needed to determine the best combinations of foods and
practices to achieve these levels of energy intake.
✔ Increase feeding frequency as the child ages
• Feed 6– 8-month-old infants complementary foods 2–3 times per day.
• Feed 9– 11-month-old infants complementary foods 3–4 times per day.
• Feed 12– 24-month-old children complementary foods 3–4 times per day.
• Offer nutritious snacks 1–2 times per day, as desired.
✔ Gradually increase food consistency and variety as the child ages, adapting
the diet to the infant’s requirements and abilities
• Feed mashed and semi-solid foods, softened with breastmilk, if possible,
beginning at 6 months of age.
• Feed energy-dense combinations of soft foods to 6– 11-month-olds.
• Introduce “finger foods” (snacks that can be eaten by children alone)
beginning around 8 months of age.
• Make the transition to the family diet at about 12 months of age