The baby is six months old and cannot roll over.

Patient's question:

No

Doctor's answer:

Hello, there is a significant individual variation in the development of gross motor skills. Generally speaking, babies typically start to roll over at 4-5 months, sit up at 6-7 months, and crawl at 8-9 months, which is considered normal. Common causes of delayed motor development include obesity, malnutrition, intellectual disabilities, etc. According to your description, the baby can already sit, which means he is not developmentally delayed and there is no need to hurry. Rolling over late may be related to being overweight, and it indeed requires more practice.