1. Normal weight gain: A baby will experience a rapid growth period after birth, and usually its weight will more than double in the first three months after birth. After that, it will increase by about 500 grams per month. If the baby gains weight too slowly or too fast, it may need to be checked.
2. Adequate sleep: Babies need adequate sleep to promote the development of the body and brain. Generally speaking, newborns need to sleep 16- 17 hours a day, and 3-month-old babies need to sleep 14- 15 hours.
3. Good mental state: Healthy babies usually show liveliness, curiosity and interest in the surrounding environment. If the baby looks tired, listless or doesn't like to cry, it may need to be checked.
4. Normal defecation: Healthy babies should defecate several times a day, and the feces should be yellow or yellow-green soft stools. If the baby has irregular bowel movements or abnormal stool color, it may need to be checked.
5. No fever or other discomfort: Healthy babies usually have no fever or other discomfort, such as vomiting and diarrhea. If the baby has these symptoms, it may need to be checked.