Here is the English translation of the provided text: For over two months, the infant has suddenly been eating less milk. What is the reason for this?

Patient's question:

My daughter is two and a half months old (81 days old). Around the time she was about 50 days old, she suddenly started eating less milk. She used to feed every two and a half hours, but now she feeds only every five or six hours (sometimes even up to ten hours), and each feeding session is also smaller in volume than before. In nearly a month, her weight hasn’t increased, but she is in good spirits, and her bowel movements and urination are normal. What could be the reason for this? Should she see a doctor?

Doctor's answer:

Hello, in the first two months after birth, babies are usually very focused on feeding and gain weight quickly. The first 2 to 4 months are generally the fastest period of growth; this temporary loss of appetite is known as the physiological anorexia period. Its characteristics are that the child is developing normally and is very active, but their milk intake temporarily decreases, usually returning to normal appetite within about a month.
Mothers need to help their children through this period by first distinguishing whether the loss of appetite is physiological or pathological. Unlike physiological anorexia, pathological anorexia is accompanied by symptoms such as poor appetite, poor sleep, and low energy. In this case, it is essential to take the baby to the hospital for examination and treatment, as loss of appetite is merely a symptom accompanying acute or chronic illnesses.