Answer you im worry your 7 month old baby are not sit with support?

Don't worry about it. The normal range for a baby sitting without support is 7-9 months, so your baby is not considered delayed at all, especially if the child is developing normally in other areas.

Sitting without support is only one of many markers we use to evaluate the development of a child. If only one marker is delayed but the rest are normal, the child is still considered normal. The problem is when the child is delayed in several areas, then the child may have a delay and needs to be evaluated.

If your baby is not able to sit at the age of 9 months, then you may want to bring them to see their pediatrician so that they can check some of the other markers.