If your baby is not getting enough breast milk, this can hamper their growth. You may see signs of lethargy, unusual weight loss. Their stools and urine may look different. On the whole, you may see that your baby is not thriving. This means you may also observe mood fluctuations, they lose interest in consuming milk and fall asleep just after starting the feeding session. If you notice any of these changes, please consult with a pediatrician.