Q:

how I know ihave girl or boy



you can only take a guess! there are various methods available on the internet but nothing is a guarantee.

There is no sure shot way of knowing unless you do an invasive chromosome test. Sex and gender determination is a punishable offence in India.

best is don't try to know it. accept your baby with open hands be it a boy or a girl.

who so ever the baby is either boy or girl both r blessing of god.