A urine test pH of 7 does not determine whether it is a boy or a girl, it only enables you to determine the acidity or alkalinity of the urine.
There is no scientific basis for determining whether it is a boy or a girl through urine pH, so a urine test pH of 7 does not determine whether it is a boy.
Urine pH is usually used as a measure of the acidity or alkalinity of urine. A urine pH greater than 7 is usually alkaline urine, and a pH less than 7 is usually acidic urine, and does not have any effect on fertility or the birth of a boy or a girl.
The birth of a boy or a girl usually depends on the male chromosome, e.g. a boy is born when the male Y chromosome combines with the X chromosome in the female body, and a girl is born when the X chromosome combines with the X chromosome, but sex determination of the fetus is strictly prohibited anywhere.