It is best to switch to amino acid formula for babies with mild milk allergy because early exposure to regular formula will induce early onset of allergic constitution in infants, leading to allergy-related related diseases such as eczema, allergic conjunctivitis, allergic rhinitis, bronchial asthma, etc. And as exposure to allergic regular formula increases, allergy symptoms will become more and more severe. So conditions permitting, it is best to switch to amino acid formulas, which are formulas that thoroughly hydrolyze cow’s milk proteins into amino acids, which will not lead to allergies after direct absorption. After 8 months of age, babies can switch to deeply hydrolyzed protein formulas depending on the situation, and after 2 years of age, they can switch to partially hydrolyzed protein formulas.