Do you believe kids know the gender of the baby?

🌺Melissa🌺 • Mom of 2 lil girls; expecting #3 10/2015
My sisters would tell me that when they were pregnant their small children will cry if they were the same gender like before u even find out! Like if your pregnant with girl and if you have a daughter she will feel jealous and vice versa with a boy? Do u think its just wives tales or has it happen to u?