Here is a way of influencing the sex of your baby.

It is the Y sperm that produces a boy.
Y sperm do not like acid
So here are some tips to favour a baby boy

1 Deep penetration
Your vagina has a higher acid level at the entrance

2 Douche with baking soda and water just before sex

3 A woman’s orgasm reduces the acid in the vagina

4 Do not have sex for 4 days before ovulation then have sex 12 hours before ovulation
Y sperm are faster swimmers but do not live as long as X sperm

This is all theory and I do not know of any research that says this is true