This is not normal, as most newborns regain their birth weight within 10 to 14 days after delivery. A drop from 2.3 kg to 2 kg at 30 days suggests the baby may not be getting enough milk or may have an underlying health issue that requires prompt assessment. Episodes of continuous crying may be due to hunger, colic or discomfort, and should be assessed along with the feeding pattern and urine output. Please seek urgent review by a paediatrician and ensure regular feeds every 2 to 3 hours to help improve weight gain while monitoring wet nappies and overall activity.