When a baby coughs up milk, quickly turn the baby’s face to one side or let it lie on its side, and pat the back to prevent milk from flowing into the throat and trachea. If the coughing up of milk is severe, immediately clean the baby’s mouth to keep the airway clear. If the baby has difficulty breathing or turns blue, it indicates that milk may have entered the trachea. Place the baby on its stomach and pat its back, or stimulate the soles of its feet to cry, ensuring it can breathe.