Due to have a child who in 5 months from now, when the parents can give a name to a child (male or female)?
The name of a boy is given at his bris. In fact this is part of the bracha that is made after making the bris. Regarding the name of a girl, there are differant customs. Some people give it when the husband gets an aliya after the baby is born, some people do it the first Shabbos.
See Ramban Shemos 4-20 that Moshe didn’t want to give a name for his child until after his bris. Sheimos Ba’aretz pg. 65,