my daughter is born on june19 2023..then how can calculate her age

A. as per the birthdate of your child your child is currently 3 and half months and will be 4 months on October 19th and for examples in your child is born on 19th of June it is one month for July 19th 2 month for August 19th 3 month for September 19th and will be completing 4 month on october 19th