text: my son is 13 months old he weighs only 9kg and he still does not walk can anyone suggest what to do? he is premature baby. talk with your pediatrician about his weight, and voice all concerns. but do not stress about it.  there really isn't a set time a baby should walk, all baby's are different. my daughter who is 8 now, walked  when she was a year old and my son who is three,  didn't walk until he was 15 months. just don't worry!!!!