Excessive crying in a 20-day-old baby is common and is often due to hunger, gas, discomfort, or early Infantile Colic, but at this age, it is important to first check simple needs like proper feeding, burping after every feed, a clean diaper, and keeping the baby comfortable and not too hot or cold. Soothing methods like holding, gentle rocking, and swaddling can help. Medications like Colicure or other colic drops are generally not recommended routinely in such young infants unless specifically prescribed by a paediatrician, as their safety and benefit can be limited. Since your baby is very young, if the crying is persistent, high-pitched, associated with poor feeding, vomiting, fever, or reduced activity, you should consult a doctor promptly to rule out any medical problem.