If a baby catches a cold, it might affect their gastrointestinal function, followed by a noticeable decrease in milk intake. Furthermore, if the baby is uncomfortable, they may become fussy and cry more than usual, which can lead to increased insensible water loss. In such cases, the baby with a cold might experience less frequent urination. This is generally considered normal. However, if the baby's urination decreases but their milk intake and other conditions are stable, parents should check for swelling in the eyelids or lower limbs. If swelling occurs, it is definitely abnormal, and medical attention should be sought promptly. The doctor will conduct specific examinations based on the baby's condition and decide if treatment is necessary.