If we say that all of them are saved, apart from establishing a salvation without Christ, we are encouraging abortion.
The intention of the question surely about their spirits,--> go to Heaven or hell.
There is no spirit produced in this perishable realm, means there is no creature which can procreate that their kid can have spirit inside (whether men or animals), the spirit is some thing that not fit to this perishable realm ,the spirit fits only to the eternal realm, then if the respective spirit there then there should be God who placed them.
Ecc3:19 For that which befalleth the sons of men befalleth beasts; even one thing befalleth them: as the one dieth, so dieth the other; yea, they have all one breath;
so that a man hath no preeminence above a beast: for all is vanity.
3:20 All go unto one place;
all are of the dust, and all turn to dust again
Zec12:1 The burden of the word of the LORD for Israel, saith the LORD, which stretcheth forth the heavens, and layeth the foundation of the earth,
and formeth the spirit of man within him.
So as both men and animals can procreate their kids then surely they are merely vessels or camps , where god may place a spiritual being inside the vessel , does God place the spirits to all the vessels?.
No, even the vessels of the men , not to all of them God placed the spiritual beings that God planed (before the creation of the world) to be created physically to wander/to sojourn to this perishable planet , then there are two kinds of men in the eyes of God ; born of God , born of flesh ( so there are Esau Jacob , Cain Abel , the chosen people( in OT Isrl) the people beyond Isrl .
Rom9:7 Neither, because they are the seed of Abraham, are they all children: but, In Isaac shall thy seed be called.
9:8 That is,
They which are the children of the flesh, these are not the children of God: but the children of the promise are counted for the seed
John1:12 But as many as received him, to them gave he power to become the sons of God, even to them that believe on his name:
1:13
Which were born, not of blood, nor of the will of the flesh, nor of the will of man, but of God
With this formula then the premise
“Salvation is only by God’s Grace” can be stated firmly, also in the last judgement (GWT ) the devils shall be judged , How can the devils be judged if all the vessels God uses for the vessels of His people ? ( how can the evidence be obtained for judging them ), How can the devils transform to be the angels of light ? (what kind of camp they can use ?).
Rev20:11 And I saw a great white throne, and him that sat on it, from whose face the earth and the heaven fled away; and there was found no place for them.
20:12 And I saw the dead, small and great, stand before God;
and the books were opened: and another book was opened, which is the book of life: and the dead were judged out of those things which were written in the books,
according to their works.
Now we can answer the OP.
The children which are born of God surely go to heaven.
The children which are born of flesh ,they are merely empty vessels /with no spiritual beings inside surely finish as the dust.
Note; one day the born of flesh child is possible to be the devil camp/vessel , so then by this vessel works the devil can be judged (evidence for the court ) .
Gen3:14 And the LORD God said unto the serpent, Because thou hast done this, thou art cursed above all cattle, and above every beast of the field; upon thy belly shalt thou go,
and dust shalt thou eat all the days of thy life
Mark5:11 Now there was there nigh unto the mountains a great herd of swine feeding.
5:12 And all the devils besought him, saying,
Send us into the swine, that we may enter into them.
5:13 And forthwith
Jesus gave them leave. And the unclean spirits went out,
and entered into the swine: and the herd ran violently down a steep place into the sea, (they were about two thousand
and were choked in the sea.