Patient's question:
Here is the English translation of your text, with line breaks preserved as requested:"Hello, my child is five and a half months old and hasn't started teething yet. Is this normal? How many months old do babies usually start teething? Is there a relationship between the early or late teething and calcium deficiency?"
Doctor's answer:
Under normal circumstances, babies start teething between six to eight months after birth. Some babies may begin teething around four months, but due to individual differences, some infants may not start teething until around one year old. If a baby has not started teething by the age of one, it is important to take them to the hospital for a check-up to test for trace elements. It could be due to calcium deficiency. It is recommended to let the child get more sun exposure to help with calcium absorption. Additionally, include more soy products, deep-sea fish, and shrimp in their diet.