A 6 months old child having severe dehydration comes to the casualty with weak pulse and unrecordable B.P. Repeated attempt in gaining I.V. access has failed – The next best step is –

"If I.V. route is unsuccessful, introasseus access in the proximal tibia of an uninjured leg is the preferred alternative for children younger than 6 yrs. In children older than 6 yrs a percutaneous femoral venous line should be attempted.