New Delhi: In a case of alleged medical negligence, a four-month-old baby died at a city hospital on Friday, after being administered a pain killer injection to provide temporary relief from the pain caused by a stitch in the upper lip.  According to the family, the baby was taken to Delhi`s Rohini-located Jaipur Golden Hospital on January 17 after the baby had suffered a cut in the upper lip. They were informed that the doctors were planning to put a stitch…