I think that question really depends on how you define the phrase “meant to be”.
If the question is whether every life is infinitely valuable to God and worth a chance at a full life then I would emphatically say yes, the Bible teaches that all life is precious.
If you are asking whether God knows who will and won’t be borne then I would have to say that he does since it is clear in Scripture that he knows the end from the beginning.
Now if (and I think this is the culmination of the other two for most people) you are asking whether God has a hand in who lives or dies and has a reason for some living and some dying then I think we need to back up and remember the above two facts in addition to what God essentially told Job through a blistering series of questions.
Specifically, that God is not the only actor in history. Even though he knows and is more powerful than the other actors (such as Satan and you and I) God is not obligated to prevent them from causing evil of their own and generally acting against his will.
We also need to keep in mind that while God knows the end from the beginning, we also know that this world is not the perfect one God is working towards. In Genesis 3 sin entered the picture and had a profound effect on everything, including the human reproductive system such that some children are lost to what we could call “natural evil” and some children are lost to evil someone intentionally does (like abortion).
It is important to keep in mind that we essentially live in a war zone between heaven and hell and until Jesus comes back we should expect to see evil like the loss of innocent children.
This is actually one of the reasons the Gospel is called the “good news” because it lets us know that the death and destruction we find all around us here on earth will not last forever and that Jesus, by rising from the dead, has conquered death which provides us hope.
In other words, even the children who don’t make it aren’t completely lost.