my son born on June 5 so now what month how to calculate month I'm new mom first time so I had many doubts wen my son roll tummy and sit wen head control

A. On fourth of October your child completed the age of four months once your child completes the age of six months after that you can make your child sit with support you can start giving food to the child and rollovers can be seen between the age of 3 to 9 months so give more of tummy time to the child and encouraged to reach the milestone