Teething at 4 months often causes gum irritation, drooling, and fussiness. You can soothe their discomfort by offering a clean, chilled teether or gently massaging their gums with a clean finger. A popular trick is to dip a clean muslin cloth in breast milk and freeze it for a short time; the texture and cold temperature provide excellent relief. If the baby remains inconsolable, consult your pediatrician about safe ways to manage their pain, but avoid medicating without professional guidance.