V1 angles posteriorly between longus colli medially and scalenus anterior laterally behind the common carotid artery to enter the transverse foramen of C6. Relations: 1  anteriorly: common carotid artery, vertebral vein, thoracic duct (left VA) and lymphatic duct (right VA).
9. For an easy-to-use graphical illustration of when baby should sit up, please see our baby development chart. What this information says is that at age 7 months, roughly 70% of all babies can sit alone for short periods of up to about half a minute. And 90% of all babies can do so by about 9 months old..Similarly, by about 3 months about 50% of all babies can sit when supported with cushions. Letâs say have a baby of about 7 months old who does not sit alone for short periods.nd 90% of all babies can do so by about 9 months old.. Similarly, by about 3 months about 50% of all babies can sit when supported with cushions. Letâs say have a baby of about 7 months old who does not sit alone for short periods.
She should be about 8 months old by now and able to sit easily without much support. Providing Support. As your baby is developing the necessary skills to sit independently, you can help him sit with help -- just make sure he has the necessary neck and trunk control first. Sit on the floor and spread your legs out. Place your baby into the V created by your legs and support him gently with your hands on both sides of his ribcage. Encourage him to prop himself up with his hands in front of him. As he is able to sit without propping himself with his hands, let him play with a toy as he sits near you.