<prompt> A baby placed in the prone position is able to lift the head and upper chest on extended arms by?1 month3 months6 months9 months  <response>: Ans. c 6 MonthsRef: OP Ghai 8th ed.154 Head lag disappears by 3 months Head control is achieved by 4 months A child in prone position at 3 months can lift chin off the bed, but it takes a while for the shoulder muscles to develop sufficient strength so as to lift the chest and head off the bed. This activity would be possible by 6 months Wave bye-bye by 9 months Stand without support at 12 months And can run by 18 months 