Fish has high protein content and is easy to digest and absorb, but pickled fish, raw fish, and heavily polluted fish are not recommended for maternal consumption. 1. Pickled fish: Pickled fish contains too much salt, long-term consumption can cause water and sodium retention, and mothers are prone to hypertension. 2. Raw fish: Sashimi fish, such as salmon, is not cooked in any way. Sashimi fish contains a large number of bacteria and parasites, which can cause bacterial and parasitic infections, and may cause different degrees of harm to the mother’s body, and these harmful substances will also be transmitted to the baby through breast milk, causing discomfort to the baby. 3. Fish from areas with serious water pollution: For example, the water near a biochemical plant has excessive levels of mercury and other heavy metals, or the ponds adjacent to rice paddies have pesticide residues. After a woman consumes fish from polluted waters, harmful substances can be passed to her baby through breast milk, which may affect the baby’s development and growth later in life. During breastfeeding, mothers should be cautious in choosing food and pay attention to a reasonable and balanced diet to avoid irreversible consequences.