Goof?
Let me start by saying, I haven't seen this movie nor have I seen the original series, but... I have heard the character is specifically never referred to as a girl or boy ,leading te viewers to use their imaginations as to whether the child is male or female. In the plot description here it refers to the child as a boy.
Is it true that the child is a boy? I understand yes the actor is a boy, but that doesn't mean the character is a boy. Or should the plot be reworded to show the nongendered child?