my girl baby is 5 months and 20 days old not yet her backbone is stiff is there any issue when she will sit by own how can i know she is n a normal growth phase

A. end of six months baby can sit with support end of eight months baby can sit without support For further advice it is advisable to consult your local doctor for appropriate examination if there is need for investigations also then only proper treatment can be given to you o . K .