I believe all children before they know to refuse evil and choose good, will be with the Lord no matter when they are born.
Deu 1:37 Also the LORD was angry with me for your sakes, saying, Thou also shalt not go in thither.
Deu 1:39 Moreover your little ones, which ye said should be a prey, and your children, which in that day had no knowledge between good and evil, they shall go in thither, and unto them will I give it, and they shall possess it.
Isa 7:16 For before the child shall know to refuse the evil, and choose the good, the land that thou abhorrest shall be forsaken of both her kings.